Complete
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1 9 11 14 21 22 24 17 2 15 8 18 3 4 12 23 5 10 16 19 25 6 20 7 13
  1. 1a HEADGEAR? (4)
  2. 3a Trounced (8)
  3. 9a Agricultural tool shaped like a pickaxe (7)
  4. 10a Small hammer (under which things may be sold) (5)
  5. 11a Swiss mathematician, d. 1783 (5)
  6. 12a Accessible by computer (6)
  7. 14a Sweets collectively (13)
  8. 17a 1960 Hitchcock film (6)
  9. 19a Mode of transport (5)
  10. 22a Spotted scavenger (5)
  11. 23a Tortilla — I or Burt (anag) (7)
  12. 24a Weary (8)
  13. 25a Garden of England (4)
  14. 1d Start (8)
  15. 2d Flower part (5)
  16. 4d Act in a way likely to cause a problem (3,3,7)
  17. 5d Business magnate (5)
  18. 6d Malicious retaliation (7)
  19. 7d Uninteresting (4)
  20. 8d Unrefined (6)
  21. 13d Becoming extinct (5,3)
  22. 15d Beginning to develop (7)
  23. 16d Clamour (6)
  24. 18d Noise of metal on metal (5)
  25. 20d Still breathing (5)
  26. 21d Raymond Blanc, for example (4)