1. Computing pioneer Lovelace → ADA
2. Argue → DISPUTE
3. Neutralized, as an explosive situation → DEFUSED
4. Launch → START
5. Org. in charge of school fund-raisers → PTA
6. One who might ask "Fair dinkum?" → AUSSIE
7. Like some minor celebrities → DLIST
8. Asahi Super Dry or Kirin Lager → RICEBEER
9. Org. that oversees air quality initiatives → EPA
10. Bit in a round of "He loves me, he loves me not" → PETAL
11. Professor ___ (title for some retirees) → EMERITA
12. Light lager → PILSNER
13. The Cards, on scoreboards → STL
18. Cover letter accompaniment → RESUME
19. Mardi Gras city, informally → NOLA
23. Poke → JAB
24. Music app named for a figure in Greek myth → PANDORA
25. Pigmented rings → AREOLAS
26. Part of L.G.B.T.Q.+ → GAY
32. "By Jove, that's it!" → AHA
33. 33-Across, across the Atlantic → ZED
34. Web portal launched with Windows 95 → MSN
36. Malfunctions in the Matrix, in "The Matrix" → GLITCHES
37. Sound of a sad trombone → WAHWAH
38. Many an animated meme loop → GIF
39. To date → ASOFNOW
40. Silverback, for one → GORILLA
43. Built to last → DURABLE
44. Give for safekeeping → ENTRUST
45. "How stupid of me!" → DOH
47. "Edie & ___: A Very Long Engagement" (2009 documentary) → THEA
48. Bring into harmony → ATTUNE
51. With a wink, say → WRYLY
52. Smooths (out) → IRONS
53. On a regular basis → OFTEN
57. Special ___ → OPS
58. "J to ___ L-O! The Remixes" (2002 Jennifer Lopez album) → THA
59. One of the four fundamental states of matter → GAS
60. Some Ph.D. students → TAS