1. One side of a consumer "war" → PEPSI
2. Not put up resistance, say → ADAPT
3. Characters in "The Lord of the Rings" → RUNES
4. Condition formally known as atopic dermatitis → ECZEMA
5. Starting line at a starting line → READYSETGO
6. Mental health org. → APA
7. Word with extra or living → LARGE
8. Spinning ring, informally? → PRTEAM
9. Plan B, for seniors → SAFETYSCHOOL
10. It's on the right in the second row → THREEPIN
11. Throw, maybe → RUG
12. Bolted some nuts down → ATE
13. "___ Blues" (Beatles song) → YER
16. Derivative of sin → COS
20. Dismayed reaction to a tag → STICKERSHOCK
23. Contents of some sheets → RAIN
25. "Bloody" queen → MARYI
26. Job that requires a lot of memorization → ACTOR
27. Figure in Michelangelo's "The Last Judgment" → JESUS
30. Locales with many banks → SKATEPARKS
31. Kind of bar that's hard to pass → LIMBO
32. It comes with a parting of the ways → ADIEU
33. Houston and New Orleans → PORTS
35. Hunk → GOB
38. Ramble away → NATTERON
39. Sound the alarm → WARN
44. Chest: Prefix → STETHO
46. Break from the group, say → GOSOLO
49. Actress Alexander of "Get Out" → ERIKA
50. "No doubt!" → OHYES
51. Saint ___ (Caribbean isle) → LUCIA
52. Lay out → SPEND
54. Small songbird → TIT
56. Scoreboard tally: Abbr. → PTS
57. It's good for tricks → ACE
58. Not just a → THE
59. The 1900s, e.g.: Abbr. → CEN