Theme: BREAK THE BANK. Various words for "money" are strewn through each theme answer.
20. Electrical unit: KILOVOLT. LOOT - often refers to stolen money or goods.
59. Bayou critter: CRAWFISH. CASH - the only word here for money that isn't slang.
61. Wedding party member: BRIDESMAID. BREAD - since bread was the traditional everyday necessity of life, to earn one's living was to earn one's bread, therefore bread became synonymous with money.
39. Share good fortune, as suggested in four sets of circles: SPREAD THE WEALTH. Sometimes the circles are not needed, but with this one, I'm pretty sure I wouldn't have found the dough.
Across:
1. WCs: LAVS. Plumbing manufacturers often use the term "water-closet" to differentiate toilets from urinals. American plumbing codes still refer to a toilet as a "Water Closet" or a "WC". The Royal Spanish Academy Dictionary accepts "váter" as a name for a toilet or bathroom, which is derived from the British term "water-closet."
5. Rope fiber plants: HEMPS.
10. Shell game, e.g.: SCAM.
14. Hodgepodge: OLIO.
15. Wedding: UNION.
16. Somewhat, in music: POCO. Also a band from the '70's. Who knew they were still touring?
17. Blockhead: CLOD. Don't hear this word much any more.
22. "Citizen Kane" director: WELLES.
23. Fill with love: ENAMOR.
24. Flower part: SEPAL. A sepal is a part of the flower of angiosperms. Usually green,
sepals typically function as protection for the flower in bud, and often
as support for the petals when in bloom.
26. Philosophy suffix: ISM.
28. Antediluvian: OLD. "Of or belonging to the time before the biblical Flood."
29. Talk, talk, talk: YAK.
32. Drive away: REPEL.
36. With the bow, in music: ARCO. "Arco (which is not an
abbreviation) means to return to bowing after pizzicato (abbreviated
pizz.) or col legno. Pizzicato means you pluck the strings with your
fingers instead of using the bow, col legno using the wooden backside of
the bow instead of the hairs."
38. "__ Lisa": MONA.
42. Ore bed: VEIN.
43. Multivitamin ingredient: IRON.
44. Compare: LIKEN.
45. Fielder's strong throw: PEG.
46. Cultural Revolution leader: MAO.
47. Recede: EBB.
49. Does some mending: DARNS.
51. Disaster area thief: LOOTER. Again with LOOT.
56. Gauguin's island retreat: TAHITI. Foul man, fine artist.
63. Inevitable outcome: FATE.
64. What Benjamin Button did backward: AGED.
65. Not windy: TERSE.
66. Side squared, for a square: AREA. Ohhhhh .... math.
67. Like Santa's cheeks: ROSY.
68. Eyelid woes: STYES.
69. Metallica drummer Ulrich: LARS.
Down:
1. Age of Enlightenment philosopher: LOCKE.
2. Do-or-die Texas Hold 'em bet: ALL IN. For Gilmore Girls fans, this phrase is not about poker.
3. String quartet instrument: VIOLA.
4. City destroyed in Genesis: SODOM.
5. Caters to: HUMORS.
6. Carbon compound: ENOL.
7. Freebies near the register: MINTS. Never turn down a mint.
8. Faddish '90s disc: POG.
9. Road maintenance vehicle: SNOW PLOW.
10. Mop target: SPILL.
11. Shade of black: COAL.
12. Proactiv+ target: ACNE.
13. What some proverbial stones don't gather: MOSS. I'll be hearing Bob Dylan all day in my head. How does it feel?
19. Detective's need: LEAD. Not clue.
21. "And there you have it!": VOILA and VIOLA (3D) in same puzzle.
25. Epoch in the Cenozoic Era: EOCENE.
27. __ of honor: MATRON.
29. Egg part: YOLK.
30. Get the pot going: ANTE.
31. Madeline of "Blazing Saddles": KAHN. So talented, she passed away in 1999.
32. "Let us know if you're coming" letters: RSVP.
33. Duel tool: EPEE.
34. Uptight type: PRIG. Funny word.
35. Bard's nightfall: E'EN. Contraction for evening.
37. Density symbol, in physics: RHO. Also the 17th letter of the Greek alphabet. Looks like a p - ρ.
38. __ tai: MAI.
40. Nin and Frank: DIARISTS.
41. Macaroni shape: ELBOW.
46. Pal at the barbie: MATE. Not Midge or Ken.
48. Turbine parts: BLADES.
49. One of Sean Combs' stage names: DIDDY. Also Puff Daddy.
50. Hair-raising: SCARY.
52. Butcher shop byproduct: OFFAL. Entrails and internal organs. The Offal-Eater’s Handbook.
53. Sparkly crown: TIARA.
54. Perfume compound: ESTER.
55. Relatives of emus: RHEAS.
56. Lift up the slope: T-BAR.
57. Golden Fleece ship: ARGO.
58. Goes quickly, quaintly: HIES.
60. Ascend: RISE.
62. Bumped into: MET. Okay - but met seems more planned than unexpected.