Complete
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8 9 11 14 18 22 24 1 2 19 3 13 12 4 10 17 15 5 21 23 20 6 16 7
  1. 1a Relaxing location to sit (7,5)
  2. 9a Posh people, in UK slang (5)
  3. 10a Deliberate (7)
  4. 11a Viable project (4)
  5. 12a Fiery curry (8)
  6. 14a Irrigates (6)
  7. 15a Disintegrate (6)
  8. 18a Festering (8)
  9. 20a Mendacious individual (4)
  10. 22a Space indicated with a 'P' (7)
  11. 23a Pause (3-2)
  12. 24a Arrest conmen (anag) – protest (12)
  13. 2d Unconventional (7)
  14. 3d Judas's act of betrayal (4)
  15. 4d Table cloth? (6)
  16. 5d US-born, London-educated crime writer Raymond ___, d. 1959 (8)
  17. 6d Declare invalid (5)
  18. 7d Treatment using x-rays, gamma rays or subatomic particles (12)
  19. 8d It's meant to be overheard (5,7)
  20. 13d Half or third? (8)
  21. 16d Brainless (7)
  22. 17d Burden (6)
  23. 19d Online discussion site (5)
  24. 21d Guilty – or not? (4)