1. Tour overseer, for short → PGA
2. Chicago airport code → ORD
3. ___ Minella ("The Muppet Show" Muppet) → SAL
4. Poker declaration → IMIN
5. Set sail → EMBARK
6. The "S" of A.B.S. → SYSTEM
7. Mallorca, por ejemplo → ISLA
8. One pitied by Mr. T, in a catchphrase → FOOL
9. Scissor cut → SNIP
10. Words with one's right hand raised → OATH
11. Novel feature of the 1974 Olds Toronado → AIRBAG
12. Visibly disdainful → SNEERY
13. Shindig → PARTY
16. "I love you," in Spanish → TEAMO
20. Prefix for element #8 → OXY
21. Indian tourist city → AGRA
22. Transport between terminals → TRAM
23. "Star Wars" princess → LEIA
27. Split ___ (New Wave band whose name sounds like a hair problem) → ENZ
28. American author whose life span closely coincided with Halley's comet visits → TWAIN
29. Sarcastic laugh syllable → HAR
30. Be behind → OWE
31. ___-di-dah → LAH
35. See 47-Down → ORG
36. Negative logic gate that works similarly to "and" → NOR
37. Sports grp. for Coco Gauff → WTA
38. Not lease, say → OWN
39. One-eighties → UEYS
40. Unappetizing food → SLOP
41. Europe's highest volcano → ETNA
44. Computer whiz → TECHIE
45. Drum kit components descended from "sock cymbals" → HIHATS
46. ___ Holmes, Netflix character played by Millie Bobby Brown → ENOLA
47. With 35-Down, URL ending for Wikipedia → DOT
48. Any poster on Yelp, essentially → CRITIC
49. Squirrel's hoard → ACORNS
50. Just now → NEWLY
54. West side? → LEFT
55. Mayberry boy of '60s TV → OPIE
56. McIntosh (or Macintosh) component → CORE
57. Port of Yemen → ADEN
58. One famously preparing for a flood → NOAH
61. "... ___ lack thereof" → ORA
62. Brita competitor → PUR
63. Pennzoil competitor → STP