Complete
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7 9 11 14 18 21 1 24 2 12 3 19 22 4 13 17 15 5 16 20 6 10 23 8
  1. 1a Instructive (11)
  2. 9a One way to leave school? (9)
  3. 10a Piece of software for a mobile phone, say (3)
  4. 11a Rabbit — Pan — Piper (5)
  5. 13a Be horribly hot (7)
  6. 14a Top builder? (6)
  7. 15a Qualification (6)
  8. 18a Master musician? (7)
  9. 20a Not glossy (5)
  10. 21a One with a total addiction? (3)
  11. 22a Place between one thing and another (9)
  12. 24a Score — at Rochester (anag) (11)
  13. 2d Guacamole or hummus, say (3)
  14. 3d Unit of energy or heat (7)
  15. 4d Desire (for a drink?) (6)
  16. 5d Imperial unit of weight equal to 28.35 grammes (5)
  17. 6d The ___ , 1960 Billy Wilder film starring Jack Lemmon and Shirley MacLean (9)
  18. 7d Mood — disposition (11)
  19. 8d Basic tool for carpenters and surveyors (6,5)
  20. 12d Sports car (or sofa?) (3-6)
  21. 16d Fan (7)
  22. 17d Speaking parts? (6)
  23. 19d It's seen above the knee (5)
  24. 23d Poetically frequent (3)