Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a A and O, for instance (5,5)
  2. 7a Convoluted (8)
  3. 8a Next in line? (4)
  4. 9a Gangster's girlfriend (4)
  5. 10a Largest living bird (7)
  6. 12a Oppressed (11)
  7. 14a Handcuff (7)
  8. 16a Hairdo — skullcap (4)
  9. 19a Supermarket chain (4)
  10. 20a Dramatic performer? (8)
  11. 21a Self-absorbed (10)
  12. 1d Besom (5)
  13. 2d Discharge of water (7)
  14. 3d Double acts (4)
  15. 4d It controls electricity flow in a circuit (8)
  16. 5d ___ Pendragon, King Arthur's father (5)
  17. 6d Common mineral, sometimes translucent and of gem quality (6)
  18. 11d Sporty (8)
  19. 12d Very much (6)
  20. 13d Tube for dispensing small amounts of liquid (7)
  21. 15d Reducing drastically (5)
  22. 17d Former Belgian currency (5)
  23. 18d Coffee-maker? (4)