Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Tweaking (10)
  2. 7a Leaflet (8)
  3. 8a End of filming for the day (4)
  4. 9a Short branch railway line (4)
  5. 10a Artistic cover-up? (3,4)
  6. 12a Balanced (4-7)
  7. 14a Set up a fake internet profile — sift cha (anag) (7)
  8. 16a Egg cell (4)
  9. 19a Departed — late (4)
  10. 20a Undying (8)
  11. 21a Lacking gravity? (10)
  12. 1d Equestrian controls (5)
  13. 2d Objective (7)
  14. 3d Its flow is controlled by the Aswan High Dam (4)
  15. 4d Compassionate (8)
  16. 5d Stair post (5)
  17. 6d Item of fake news (6)
  18. 11d Urgent (8)
  19. 12d Ebb (6)
  20. 13d Marital break-up (7)
  21. 15d Soft creamy sweet (5)
  22. 17d Signifies — money (5)
  23. 18d A black mark? (4)