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 True concept (which can be sad or plain) (4)
  2. 3a Without a hitch (8)
  3. 9a Send up (7)
  4. 10a Vertical pipe inside a building (5)
  5. 11a Work by Bridget Riley, for instance (2,3)
  6. 12a Joining into a single entity (6)
  7. 14a Sell short? (13)
  8. 17a Blend of Indian spices (6)
  9. 19a Heraldic black (5)
  10. 22a Impromptu (2,3)
  11. 23a Enjoy excessively (7)
  12. 24a Core principle — to Keynes (anag) (8)
  13. 25a Bank (on) (4)
  14. 1d Sequel (6-2)
  15. 2d It breaks up a sentence (5)
  16. 4d Expression (13)
  17. 5d Cruel and wicked persons (5)
  18. 6d Cry of devotion (7)
  19. 7d Long ago (4)
  20. 8d Straw hat with a flat crown (6)
  21. 13d Necropolis (8)
  22. 15d Cadaverous (7)
  23. 16d Job, story or track? (6)
  24. 18d Where The Gold Cup is run annually in June (5)
  25. 20d Swell outwards (5)
  26. 21d Barrel for holding liquid (4)