Theme: "Is that your final answer?" - The ends of the theme entries are synonyms of END.
17A. It's heedless to go off it : THE DEEP END
28A. Car-waxing result : LUSTROUS FINISH
47A. Motion on a mound : PITCHER'S WIND-UP
63A. Director's cry, and hint to the ends of 17-, 28- and 47-Across : "THAT'S A WRAP!"
Argyle here. (I hope.) Sure got a quick send off in the NW corner. No hobos in sight.
Across:
1. Jay who's on late : LENO
5. Crop up : ARISE
10. 1974 CIA vs. KGB spoof : S*P*Y*S
14. Vehicle behind dogs : SLED
15. Summer skirt material : LINEN
16. McDonald's founder Ray : KROC
19. Davenport's state : IOWA
20. One-__: biased : SIDED
21. Ancient Mexican : AZTEC
23. HIV-treating drug : AZT
24. "Hold on __!" : A SEC
26. Family nicknames : MAMMAs and 59D. Grandma : NANA
33. Letters linking real and assumed names : AKA. (also known as)
34. Lures : ENTICES
35. Himalayan republic : NEPAL
38. Invoice add-on : TAX
39. Choir room hangers : ROBES
43. "Over my dead body!" : "NO SIREE!"
46. MouthHealthy.org org. : ADA. (American Dental Association)
51. Dwarf planting : BONSAI
52. Polish prose : EDIT
53. Mil. training center : OCS. (Officer Candidate School)
54. Wood shop tool : LATHE
58. Prefix meaning "culture" : ETHNO
61. Work hard : TOIL
65. Savvy about : ONTO
66. __ voce: softly : SOTTO
67. Skye of "Say Anything ..." : IONE
68. Mark for removal : X OUT
69. Deplete : USE UP
70. Start of a classic Christmas poem : 'TWAS
Down:
1. D-Day fleet : LSTs. (Landing Ship, Tank)
2. Pre-college, for short : ELHI
3. Must have now, in memo-speak : NEED ASAP
4. Most peculiar : ODDEST
5. Stein filler : ALE
6. Kelly in Electrolux ads : RIPA. Notice the music.
7. Mother of Don Juan : INEZ
8. Transmitted : SENT
9. Natural to a region : ENDEMIC
10. Enjoy a winter sport : SKI
11. Some charity golf tournaments : PRO-AMs
12. Cry of surprise : "YOWZAH!"
13. Sings like Ella : SCATS
18. German river : EDER
22. Wicker worker : CANER
25. Runner Sebastian : COE
27. Sushi bar soup : MISO
28. PC linkup : LAN
29. Tiny Tim's instrument : UKE
30. Loosen, as laces : UNTIE
31. "Act Naturally" singer Ringo : STARR
32. Puts back together : FIXES
36. Picnic crashers : ANTS
37. From around here : LOCAL
40. Infielder's mistake : BAD THROW
41. Academic address ending : .EDU
42. Breakfast syrup source : SAP
44. Massage technique : SHIATSU. Wiki LINK.
45. Female in the flock : EWE
47. __ Raceway: Pennsylvania NASCAR track : POCONO
48. Latin for "where it originally was" : IN SITU
49. Creative output : IDEA
50. Blockhead : NITWIT
51. Anti-crow's-feet treatment : BOTOX
55. Pres. Jefferson : THOS. Abbreviated written form of Thomas.
56. Despise : HATE
57. Words to a traitor : "ET TU?"
60. Unlocks, poetically : OPES
62. Subdivision unit : LOT
64. Bread for dipping, say : SOP. We've been getting both versions of the word.
The real end.
Argyle