Complete
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1 9 11 16 18 22 24 13 2 14 3 19 8 12 23 4 25 5 10 15 20 6 21 7 17
  1. 1a Mucky (6)
  2. 4a Circulate (6)
  3. 9a Branch off (7)
  4. 10a Promotional guff (5)
  5. 11a Communications medium (5)
  6. 12a Because of that (7)
  7. 13a Loo (5,6)
  8. 18a Expressing deep emotion (7)
  9. 20a What proverbially follows day (5)
  10. 22a Light semi-transparent fabric (5)
  11. 23a Supermarket vehicle (7)
  12. 24a Spin (6)
  13. 25a Comparatively near (6)
  14. 1d Felt hat with a creased crown (6)
  15. 2d Furious (5)
  16. 3d Secretion from an endocrine gland (7)
  17. 5d Permeate (5)
  18. 6d Whole-milk holey cheese (7)
  19. 7d Fertilised human egg (6)
  20. 8d Sign (11)
  21. 14d Fly people and goods to places not otherwise accessible (7)
  22. 15d Score at the wrong end (3,4)
  23. 16d Dribble (6)
  24. 17d Horse (or person) that can go the distance (6)
  25. 19d Chin split (5)
  26. 21d Government fixed-interest securities — young sows (5)