Complete
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1 9 11 16 18 22 24 13 2 14 3 19 8 12 23 4 25 5 10 15 20 6 21 7 17
  1. 1a Apply incorrectly (6)
  2. 4a Cause to happen (6)
  3. 9a US mail identification symbols (3,4)
  4. 10a Sub (1-4)
  5. 11a Capital of Tibet (5)
  6. 12a Treated animal skin (7)
  7. 13a In (11)
  8. 18a Doobry (7)
  9. 20a A or E, as opposed to B, C and D (5)
  10. 22a One more time? (5)
  11. 23a Covered underground access (7)
  12. 24a Barter (6)
  13. 25a In a profound way (6)
  14. 1d Very light rain (6)
  15. 2d Brown pigment made with cuttlefish ink (5)
  16. 3d Gut (7)
  17. 5d Animals (5)
  18. 6d Highly significant in bringing about change (7)
  19. 7d Private coaches (6)
  20. 8d Trousers flared below the knee (4-7)
  21. 14d Startling (7)
  22. 15d Money lent (7)
  23. 16d Shift over (6)
  24. 17d Ready for bed? (6)
  25. 19d Nick (5)
  26. 21d Joyous shout (5)