Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Up to the minute (6)
  2. 4a Aspect (5)
  3. 7a Turkish capital (6)
  4. 8a Jagged mountain range (6)
  5. 9a Wind instrument (4)
  6. 10a Recoil — bung (8)
  7. 12a Maker of circular wooden objects (11)
  8. 17a Rubber-bladed wiper for removing water (8)
  9. 19a Tip — top (4)
  10. 20a Philosopher's stone (6)
  11. 21a Camera stand (6)
  12. 22a Contaminate (5)
  13. 23a Cross (6)
  14. 1d Powerful wooden weapon used against the French at Agincourt (7)
  15. 2d Flying circus apparatus? (7)
  16. 3d Electrical device fitted in the cylinder heads of an internal-combustion engine (5,4)
  17. 4d Quick, light movement (5)
  18. 5d Place to get a vehicle clean (3,4)
  19. 6d Word of appreciation (6)
  20. 11d Woodwork (9)
  21. 13d Escape artist, Harry (7)
  22. 14d Person who cuts flat glass to size (7)
  23. 15d Small position from which future progress might be made (7)
  24. 16d Approval (6)
  25. 18d Legally-binding order (5)