1. Arose → GOTUP
2. Mertens of tennis → ELISE
3. Wasn't doing well → AILED
4. One way to enjoy the great outdoors, informally → RVTRIP
5. They break after some drives → TEES
6. Boarding datum, in brief → ETD
7. Basic baseball stat → ERA
8. Toyota models from 1978 to 1999 → TERCELS
9. Greek goddess whose name becomes a Mexican beer if you change the first letter to T → HECATE
10. Texter's disclaimer → IMHO
11. "___ am your father" (often-misquoted film line) → NOI
12. Product with the onetime slogan "An adventure in every bowl!" → ALPHABITS
13. Superficially conceal, as a problem → PAPEROVER
14. Conflicts waged on behalf of third-party powers → PROXYWARS
21. Whispered exhortation → PASSITON
24. Settled a debt reluctantly → PONIEDUP
25. When many take stock, informally? → IPOS
26. Fr. title → MLLE
28. Put away some groceries? → EATIN
29. Like many houses → EAVED
30. "I'll think about this and decide later" grouping → MAYBEPILE
31. "Apparently no" → IGUESSNOT
32. Two-in-one computer command → COPYPASTE
36. Atop → UPON
37. Atypical, to Antonius → RARA
39. Certain smock → LABCOAT
42. Does self-checkout? → PRIMPS
43. Christian who was the 2018 N.L. M.V.P. → YELICH
47. Number of Spanish provincias that touch Portugal → SIETE
48. Vibe → TENOR
49. Founder of the record label Aftermath → DRDRE
51. One direction → EAST
52. Part of a Greek Row, informally → FRAT
54. Certain fancy attire, for short → TUX
56. Cara ___ (Italian term of affection) → MIA
57. Prez with a V.P. nicknamed "Cactus Jack" → FDR