Complete
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1 8 10 12 19 21 2 18 3 13 15 4 9 16 5 14 6 17 20 7 11
  1. 1a Enchantress who gave King Arthur his sword, Excalibur (4,2,3,4)
  2. 8a St Paul's Cathedral architect (4)
  3. 9a Transport systems with carriers suspended from cables supported by towers (8)
  4. 10a Primary storey (5,5)
  5. 12a Tough and spirited (6)
  6. 14a Cricket's appeal (6)
  7. 15a Barrel organ played by cranking a wheel (5-5)
  8. 19a Nineteenth-century British PM (8)
  9. 20a Decisive point (4)
  10. 21a Undress completely (3,4,3,3)
  11. 2d Redeemable points earned by flying (3,5)
  12. 3d Years and years (5)
  13. 4d Glowing beetle (7)
  14. 5d River horse (abbr) (5)
  15. 6d Not for intellectuals? (7)
  16. 7d Knockout (4)
  17. 11d Bits off the scalp (8)
  18. 13d (Musically) a playful movement (7)
  19. 14d Stack of dried grass (7)
  20. 16d Female ruff (5)
  21. 17d Not abridged (5)
  22. 18d Narrow — excellent (4)