Complete
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1 8 10 13 16 20 22 2 3 9 19 17 4 15 14 5 12 11 6 21 7 18
  1. 1a Perfect! (4,3,6)
  2. 8a Gaelic surname prefix (3)
  3. 9a In flight (2,3,4)
  4. 10a Desire (8)
  5. 11a Eh? (4)
  6. 13a Seal — prestige (6)
  7. 14a Aprons (anag) — service provider? (6)
  8. 16a Dilapidated building (4)
  9. 17a Cain was the first! (8)
  10. 20a Decision requiring little thought (2-7)
  11. 21a Lair (3)
  12. 22a Pretend not to notice (4,1,5,3)
  13. 1d Lucky (informal) (5)
  14. 2d One seeking higher status (6,7)
  15. 3d Thrashed (8)
  16. 4d Still alive (6)
  17. 5d Notion (4)
  18. 6d London area south of Hyde Park (13)
  19. 7d Make more secure (7)
  20. 12d Chinese language (8)
  21. 13d Small crown (7)
  22. 15d Underground passage (6)
  23. 18d Enclosed kitchen fireplace (5)
  24. 19d Concealed ditch in landscape gardening (2-2)