Complete
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1 8 10 13 16 20 22 2 3 9 19 17 4 15 14 5 12 11 6 21 7 18
  1. 1a Helpful (13)
  2. 8a Town on Scotland’s southwest coast (3)
  3. 9a Source of sustenance (9)
  4. 10a Hilly, uncultivated countryside (8)
  5. 11a Pack away (4)
  6. 13a Not excessive (6)
  7. 14a Spirited (6)
  8. 16a Condemn to death (or failure) (4)
  9. 17a Means of transport (8)
  10. 20a Peripatetic (9)
  11. 21a Small (Scottish) (3)
  12. 22a Aggressive, predatory attack (7,6)
  13. 1d Warning signal (5)
  14. 2d Greenhouse gas (6,7)
  15. 3d Unthinking (8)
  16. 4d Excursion (6)
  17. 5d In the thick of (4)
  18. 6d Very similar sibling (9,4)
  19. 7d Escape (after a crime) (7)
  20. 12d Costlier (anag) – secluded setting (8)
  21. 13d Navel-gazer’s focus? (7)
  22. 15d Island off the west coast of Peninsular Malaysia (6)
  23. 18d Run-down, disreputable (5)
  24. 19d Skilled or skimmed? (4)