Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Prone to gossip? (6)
  2. 4a Hard to satisfy? (5)
  3. 7a Puzzle first published in a British newspaper in 2004 (6)
  4. 8a Underground network? (6)
  5. 9a Ancient Greek roofed colonnade (4)
  6. 10a Native Americans, now mostly living in Oklahoma (8)
  7. 12a Where to find recipes? (7,4)
  8. 17a Pieces from a bursting shell (8)
  9. 19a Flattish nail (4)
  10. 20a Sufficient (6)
  11. 21a Wilt (6)
  12. 22a Fire iron (5)
  13. 23a What goes up when rain comes down (informal) (6)
  14. 1d Corrosive (7)
  15. 2d Shade of green tinged with yellow (7)
  16. 3d Police club (9)
  17. 4d Public square with room for pedestrians (5)
  18. 5d Dutch island in the Caribbean, autonomous since 2010 (7)
  19. 6d American native (informal) (6)
  20. 11d Ship that took the Pilgrim Fathers to Massachusetts in 1620 (9)
  21. 13d Where a blade is held in a boat (7)
  22. 14d The M25, say (7)
  23. 15d Rascally behaviour (7)
  24. 16d In the Land of Nod (6)
  25. 18d Personal contacting device (5)