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

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