Complete
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1 9 11 14 21 22 24 17 2 15 8 18 3 4 12 23 5 10 16 19 25 6 20 7 13
  1. 1a Edible powdery starch obtained from certain palms (4)
  2. 3a Suggested (but not expressly stated) (8)
  3. 9a Reach a stable state (7)
  4. 10a Filled bread snack (informal) (5)
  5. 11a Speedy (5)
  6. 12a ___ Mantel, Booker Prize winning author, 2009 and 2012 (6)
  7. 14a Or (13)
  8. 17a Skivvy (6)
  9. 19a Yeast and mushrooms, for example (5)
  10. 22a Piercing (5)
  11. 23a Motivated (7)
  12. 24a First part of a three-day equestrian event — reeds sag (anag) (8)
  13. 25a Hammer-wielding Norse god of thunder (4)
  14. 1d He has quite exceptional powers (8)
  15. 2d Take hold (5)
  16. 4d Delicious-looking — a time-worn thug (anag) (5-8)
  17. 5d Categorise (5)
  18. 6d Select group united by common interests (7)
  19. 7d Playthings (4)
  20. 8d Bibliophile (6)
  21. 13d Container for gas stored under pressure (8)
  22. 15d (Inflict) suffering (7)
  23. 16d Really (2,4)
  24. 18d Small amounts of residue (5)
  25. 20d Of course (informal) (5)
  26. 21d Round of applause (4)