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 Elegant and concise — gemstone cutter (8)
  2. 5a Curved structure (4)
  3. 9a Remote in manner (5)
  4. 10a Lack of interest (7)
  5. 11a Ludicrously outdated (12)
  6. 13a Moved along the ground before take-off (6)
  7. 14a Nimble-fingered (6)
  8. 17a Be experienced in the relevant processes (4,3,5)
  9. 20a Function (7)
  10. 21a Hard to get through (5)
  11. 22a Pitched home? (4)
  12. 23a Infantile conversation (4,4)
  13. 1d Rich soil (4)
  14. 2d One rising from the ashes (7)
  15. 3d Bevel gear used on cars' rear axles (12)
  16. 4d Set of instructions (6)
  17. 6d Bones of the human forearm (5)
  18. 7d Brotherly love (8)
  19. 8d When unwelcome events seem to be recurring in exactly the same way? (9,3)
  20. 12d Secret surveillance (5-3)
  21. 15d Melanesia, Micronesia etc (7)
  22. 16d Largest city of French-speaking Switzerland (6)
  23. 18d Cinema chain (5)
  24. 19d Kiss — a Hollywood legend, d. 2003 (4)