Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Pyrotechnic device (8)
  2. 5a Called (4)
  3. 9a Thigh bone (5)
  4. 10a Easily bent (7)
  5. 11a Wind snatcher (anag) — fork-tailed bird (8,4)
  6. 13a Set of clothing (6)
  7. 14a Wood (6)
  8. 17a Device used for breaking down doors (9,3)
  9. 20a Novelty (7)
  10. 21a Invert (5)
  11. 22a Challenge (4)
  12. 23a Marauding creature (8)
  13. 1d Historic Scottish county (and kingdom) (4)
  14. 2d Surviving fragment (7)
  15. 3d Tim Berners-Lee's invention (5,4,3)
  16. 4d Go — mend (6)
  17. 6d Move at an easy pace (5)
  18. 7d Verdure (8)
  19. 8d Money raised to finance a campaign (8,4)
  20. 12d Joined (8)
  21. 15d Most valiant (7)
  22. 16d Mouth (slang) (6)
  23. 18d Tall building (5)
  24. 19d River that, with the Neisse, forms the German-Polish border (4)