Theme: Deep In The Weeds
16. Source of post-toilet training anxiety : BED WETTING
22. Surfer's destination : WORLD WIDE WEB
36. Great Depression recovery program : NEW DEAL
58. Desert plant suggested by this puzzle's circles : TUMBLE WEED
Melissa here. Appears to be a debut from Alex Eaton-Salners, and a pangram at that! For those without benefit of circles the theme might be a bit trickier - although all the theme answers are pretty gettable. The word TUMBLE hints that the circled letters are anagrams. I had a little trouble in the southwest.
Across
1. Wobbly dessert : JELLO. Cute clue.
6. Pal : BUB. Tried BUD first.
9. Vintner's tub : VAT
12. Birdlike : AVIAN
13. Drachma replacer : EURO
14. B&Bs : INNS
18. Use too much of, briefly : OD ON. (Overdose)
18. Use too much of, briefly : OD ON. (Overdose)
19. Many SAT takers : SR'S
20. Dashboard feature : DIAL
21. Reach through the air : FLY TO. This did not come easy.
25. Treat, as table salt : IODIZE
25. Treat, as table salt : IODIZE
28. Major blood vessel : AORTA
29. Male in the hive : DRONE
30. Sharp-tasting : TART
32. Trailer park parkers : RV'S
35. Actor Cariou of "Blue Bloods" : LEN
39. Question of method : HOW
40. Letters on a law office door : ESQ
41. Purges (of) : RIDS
42. "The Hot Zone" virus : EBOLA
47. Apt to malfunction, as wiring : FAULTY
48. Youngest son of Queen Elizabeth II : PRINCE EDWARD
52. Illumination units : LUXES. Did not remember this one.
53. Have __: know someone : AN IN
54. "The Night Of" channel : HBO
57. Slender woodwind : OBOE
61. Dingbat : DITZ
61. Dingbat : DITZ
62. Flat-package furniture chain : IKEA
63. River through western Germany : RHINE
64. Florida island : KEY
65. Video game initials : NES
66. Separates for the wash : SORTS
Down
1. Quick punches : JABS
Down
1. Quick punches : JABS
2. "Did you __?!" : EVER
3. The eyes have them : LIDS
4. Murphy's __ : LAW
5. Standard eggs purchase : ONE DOZEN
6. Play with Lincoln Logs, say : BUILD
7. Coffee hour vessel : URN
8. Peat source : BOG
9. Purple shade : VIOLET
10. Artist nicknamed the "Pope of Pop" : ANDY WARHOL
11. Govt. bill : T-NOTE
13. And others, in bibliographies : ET. AL.
15. Stuck-up sort : SNOB
17. Goodyear product : TIRE
21. Pres. who developed the 36-Across : FDR
22. Finish in front : WIN
23. Stuff to sell : WARES
24. Itty bit : IOTA
25. Not employed : IDLE
26. Rock groups? : ORES
27. Man of La Mancha : DON QUIXOTE
30. Packing rope : TWINE
31. Say further : ADD
33. Chevy's plug-in hybrid : VOLT
34. Rock to music : SWAY
37. Great Lake bordering four states : ERIE
38. Knowledge seekers : LEARNERS
43. Flower source : BUD
45. Companion of Bashful : SNEEZY
46. Bldg. coolers : AC'S
47. Get no credit for, in school : FAIL
48. Walk heavily : PLOD
49. Big name in puzzle cubes : RUBIK. Could not remember how to spell this, tried X and Q first for the last letter. D'oh.
50. British noblewomen : DAMES
51. Where to see the Sun, the Sky and the Stars: Abbr. : WNBA
54. Will beneficiary : HEIR
55. Like an arm in a sling : BENT
56. Lyrical lines : ODES
58. Altoids container : TIN
59. Island strings : UKE. Ukelele.
60. Question of identity : WHO