Complete
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1 8 10 13 17 21 24 2 18 3 12 11 4 16 22 14 5 9 20 19 6 15 7 23
  1. 1a Informal spoken or written expression (13)
  2. 8a Hereditary (7)
  3. 9a Aberdeen ___ (Scottish cattle breed) (5)
  4. 10a Cultivated (4)
  5. 11a Without delay (8)
  6. 13a Pleasure trip (6)
  7. 14a Make possible (6)
  8. 17a Spotify user (8)
  9. 19a The ___ (marshy region of eastern England) (4)
  10. 21a A great deal (5)
  11. 22a Sharing (anag) — chopped herbs? (7)
  12. 24a Classroom substitute (6,7)
  13. 1d Machine part (3)
  14. 2d Not strict (7)
  15. 3d They may be wild or rolled (4)
  16. 4d Release — no ruck (anag) (6)
  17. 5d Scary — marginal (anag) (8)
  18. 6d Block of cast metal (5)
  19. 7d Puréed vegetables, traditionally served with fish and chips (5,4)
  20. 10d Beauty (4,5)
  21. 12d Like hell? (8)
  22. 15d It may spoil one's 10 down (7)
  23. 16d Burden (6)
  24. 18d Do this and take notice? (3,2)
  25. 20d Major (or minor) stars? (4)
  26. 23d His female counterpart? (3)