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

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