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 Good place to hang out? (7,4)
  2. 9a Run down (9)
  3. 10a Also (3)
  4. 11a Spends time achieving nothing (informal) (5)
  5. 13a Dark and dismal (like the rivers in Hell) — isn't gay (anag) (7)
  6. 14a Sign of unhappiness (or joy?) (6)
  7. 15a Daft (6)
  8. 18a North African country where the 2011 Jasmine Revolution led to the 'Arab Spring' (7)
  9. 20a Nautical echo sounder (5)
  10. 21a Not on (3)
  11. 22a Act of retaliation (9)
  12. 24a Profligate (11)
  13. 2d Backchat (3)
  14. 3d Charles I's crime (7)
  15. 4d Pass (6)
  16. 5d Dubious (5)
  17. 6d Diet (9)
  18. 7d Enlightenment — of dietician (anag) (11)
  19. 8d In despair — end death row (anag) (11)
  20. 12d Large fruit bat (6,3)
  21. 16d Money saved for some future purpose (4,3)
  22. 17d Driver's guide (6)
  23. 19d Break off (5)
  24. 23d Hildegard of Bingen (1098-1179) was one (3)