Complete
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6 8 10 13 16 19 21 7 1 18 17 2 9 15 14 3 12 20 11 4 5
  1. 1a Spontaneous — unrehearsed (9)
  2. 8a Consume (3,2)
  3. 9a Replace what you've got with something better (5,2)
  4. 10a Gets less (8)
  5. 11a Detached, skimmed or final? (4)
  6. 13a Ancient quarter of many north African cities (6)
  7. 14a Unmoving (6)
  8. 16a Roman emperor after Claudius (4)
  9. 17a One lends a hand around the house (4,4)
  10. 19a 1968 Simon & Garfunkel song (7)
  11. 20a Happen as a result (5)
  12. 21a Mocking (9)
  13. 1d Saucy (8)
  14. 2d Comic spiel (6)
  15. 3d Rounded and slightly elongated shape (4)
  16. 4d Form that a verb may take — steepen rents (anag) (7,5)
  17. 5d Without scruples (12)
  18. 6d The basics (12)
  19. 7d Confusion (12)
  20. 12d Unearthly (8)
  21. 15d Flooring found in ancient Roman villas (6)
  22. 18d Dishonest individual (4)