Complete
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1 9 11 15 21 23 12 2 16 3 13 4 8 10 17 22 24 5 18 6 19 14 7 20
  1. 1a Slight (7)
  2. 8a Gradual decline (7)
  3. 9a Shade of pink tinged with yellow (7)
  4. 10a Simple and natural (7)
  5. 11a The 'silent' Marx brother (5)
  6. 13a Remedied (9)
  7. 15a A dog hunts (anag) (9)
  8. 18a City on the Missouri River, founded in 1854 and known as the 'Gateway to the West' (5)
  9. 21a Light-fingered folk (7)
  10. 22a Sudden forceful flow (7)
  11. 23a Collector of wild fungi, berries etc (7)
  12. 24a Facilitated (7)
  13. 1d Cut deeply (5)
  14. 2d Mistake (5)
  15. 3d Pasternak novel (6,7)
  16. 4d Delay (6)
  17. 5d Essex resort on the Thames estuary (8-2-3)
  18. 6d Exe and Wye, say (but not Zed) (6)
  19. 7d Idle (6)
  20. 12d Mother's sister (4)
  21. 14d Engrave (4)
  22. 15d Cause to explode (3,3)
  23. 16d Where birds are kept (6)
  24. 17d Doubtful (6)
  25. 19d A 30-day month (5)
  26. 20d In the future (5)