Complete
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1 8 10 13 17 21 24 2 18 3 12 11 4 16 22 14 5 9 20 19 6 15 7 23
  1. 1a Classroom stand-in (6,7)
  2. 8a Piece of ground with specific characteristics (7)
  3. 9a Criminal twins, Ronnie and Reggie (5)
  4. 10a Goddess of the rainbow and messenger of the Titans (4)
  5. 11a Contaminated (8)
  6. 13a Astringent substance in tea and wine (6)
  7. 14a Colours flown at sea to indicate nationality (6)
  8. 17a Determined (8)
  9. 19a Mediterranean meal of many small dishes (4)
  10. 21a Hebridean island, known for its malt whisky distilleries (5)
  11. 22a Allowed (7)
  12. 24a Old way for constructing internal walls — tabulated wand (anag) (6,3,4)
  13. 1d Command to a trained dog (3)
  14. 2d Helping of food (7)
  15. 3d Make available for a limited time (4)
  16. 4d Speaker system (6)
  17. 5d Not acidic (8)
  18. 6d Core (5)
  19. 7d Home (9)
  20. 10d Quiz (9)
  21. 12d Treacherous (8)
  22. 15d Lack of initiative (7)
  23. 16d Shame (6)
  24. 18d Sound of something soft and wet hitting a surface (5)
  25. 20d Unvarnished (4)
  26. 23d Wipe (3)