Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a Capital of North Rhine-Westphalia (10)
  2. 7a Cage holding poultry (7)
  3. 8a Place of calm in troubled times (5)
  4. 10a Spanish currency (4)
  5. 11a Parrot native to Australia and Indonesia (8)
  6. 13a Quell (6)
  7. 15a Make a piercing sound (6)
  8. 17a Sign of the zodiac (8)
  9. 18a Mop (4)
  10. 21a Danish currency (5)
  11. 22a Bewitching (7)
  12. 23a Social club for American male undergraduates (10)
  13. 1d Organ giver? (5)
  14. 2d Black chimney powder (4)
  15. 3d Hire (6)
  16. 4d One method of scoring three points at rugby union (4,4)
  17. 5d Badge with a ribbon (7)
  18. 6d PS He has Ken (anag) — rope-shortening knot (10)
  19. 9d Tracked vehicle for winter travel? (10)
  20. 12d Nourishing substance (8)
  21. 14d Bedroom fit for a lady (7)
  22. 16d Warm season (6)
  23. 19d Bonkers (5)
  24. 20d Trademarked hybrid citrus fruit (4)