Complete
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  1. 1a Eighth month in Roman calendar (7)
  2. 8a Unswerving (7)
  3. 9a Calm and happy (7)
  4. 10a (High) resentment (7)
  5. 11a Or any (anag) — fibre (5)
  6. 13a Leave lost for words (9)
  7. 15a That will never happen (3,6)
  8. 18a Monks' superior (5)
  9. 21a Thick flat cake, eaten toasted (7)
  10. 22a Where messages/letters received (7)
  11. 23a Sit on top of (7)
  12. 24a Swimmer's glasses? (7)
  13. 1d Remaining (5)
  14. 2d The box (5)
  15. 3d Totally unacceptable (6,3,4)
  16. 4d Lacking a pre-planned pattern (6)
  17. 5d Struggling to pick up sounds (4,2,7)
  18. 6d Rich cake (6)
  19. 7d Completely out of it (6)
  20. 12d Zone (4)
  21. 14d Roman emperor, d. AD68 (4)
  22. 15d Causal contribution to an outcome (6)
  23. 16d Artificial hair (6)
  24. 17d Spice from seed (6)
  25. 19d Tower built by Noah's descendants to reach to heaven (5)
  26. 20d Second-largest US state by area (5)