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 Exclamation of surprise (7)
  2. 8a Place for planes (7)
  3. 9a Crucially important (7)
  4. 10a Afternoon food? (7)
  5. 11a Of the kidneys (5)
  6. 13a Put by for later (9)
  7. 15a Throttled (9)
  8. 18a Fritter away (5)
  9. 21a A heathen (7)
  10. 22a Strongly felt (7)
  11. 23a Shaven part of a monk's head (7)
  12. 24a Unhealthily thin (7)
  13. 1d Delightful (5)
  14. 2d Large crow (5)
  15. 3d Material once used for building walls — adult BA wanted (anag) (6,3,4)
  16. 4d Rope for leading a horse (6)
  17. 5d A punishment diet? (5,3,5)
  18. 6d Return (2,4)
  19. 7d Pay heed (6)
  20. 12d Make audible sounds (4)
  21. 14d Compass point (4)
  22. 15d Ill-tempered (informal) (6)
  23. 16d Pay back money received (6)
  24. 17d Plants with slender stems and large trumpet-shaped flowers (6)
  25. 19d Tendon, for example (5)
  26. 20d Each one without exception (5)