Complete
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1 9 11 15 21 23 12 2 16 3 13 4 8 10 17 22 24 5 18 6 19 14 7 20
  1. 1a Brain case (7)
  2. 8a Make aware (of) (7)
  3. 9a Poker-faced (7)
  4. 10a Three-pronged spear (7)
  5. 11a Items of jewellery (5)
  6. 13a Sailors' song (3,6)
  7. 15a Set up (9)
  8. 18a Praise — honour (5)
  9. 21a Two successive lines of verse (7)
  10. 22a Lacking professional expertise (7)
  11. 23a One who doubts accepted opinions (7)
  12. 24a Train a gun (4,3)
  13. 1d Alcoholic drink (with Rosie?) (5)
  14. 2d From the top! (5)
  15. 3d This can't be! (13)
  16. 4d Utterance often repeated (6)
  17. 5d Getting out of bed very early (2,4,3,4)
  18. 6d Yield (4,2)
  19. 7d Soldier on watch (6)
  20. 12d Mid-month date in ancient Rome (4)
  21. 14d What a dog may wag (4)
  22. 15d Intemperance (6)
  23. 16d Hairpiece to cover baldness (6)
  24. 17d Undamaged (6)
  25. 19d Place where contests and spectacles are held (5)
  26. 20d Sound the strings of a guitar, say (5)