Complete
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1 9 11 15 17 21 25 2 12 3 13 20 24 26 4 18 5 16 19 14 8 10 22 6 23 7
  1. 1a All together (9)
  2. 8a Concept whose truth can be proved (4)
  3. 9a Exposed to wild blows (9)
  4. 10a Frank (4)
  5. 13a Narrow gorge with a fast running stream (5)
  6. 15a Bit sliced away from a large piece (6)
  7. 16a Tie (6)
  8. 17a It gives purpose and direction (6)
  9. 19a Spirits (6)
  10. 20a Fasten (5)
  11. 21a Welsh vegetable? (4)
  12. 24a Become very, very excited (2,7)
  13. 25a Horse (of a certain colour) (4)
  14. 26a Game for gamblers — duke's port (anag) (4,5)
  15. 2d Yashmak, for example (4)
  16. 3d One should avoid being taken for one (4)
  17. 4d Retire (3,3)
  18. 5d Show (6)
  19. 6d Cheap drinks time! (5,4)
  20. 7d Travel plan (9)
  21. 11d Science of the structure of the universe (9)
  22. 12d Not tailor-made (3-3-3)
  23. 13d Tropical fruit with yellow skin and pink flesh (5)
  24. 14d Curve that spirals around a cone, for example (5)
  25. 18d Elbow grease (6)
  26. 19d Man who lounges in hotels and bars looking for women to support him (6)
  27. 22d Military alliance with headquarters in Belgium (4)
  28. 23d Corporal punishment? (4)