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 Fortress (10)
  2. 7a Briefly and clearly expressed (8)
  3. 8a Hard by (4)
  4. 9a Sulky expression (4)
  5. 10a Dignity (anag) (7)
  6. 12a One employed to look after a golf course (11)
  7. 14a Grapple (7)
  8. 16a Two-masted square-rigged sailing ship (4)
  9. 19a Unreliable old car (4)
  10. 20a Drying-up cloth (3,5)
  11. 21a Ornamental stand for plants (10)
  12. 1d Baffle (5)
  13. 2d Hermit (7)
  14. 3d Grandma (4)
  15. 4d Direct telephone links for use in an emergency (8)
  16. 5d Island in the Bristol Channel (5)
  17. 6d Leather worker — old coin (6)
  18. 11d Blown up (8)
  19. 12d Precious stone, usually red (6)
  20. 13d Intention (7)
  21. 15d Reddish-brown (5)
  22. 17d Long-necked, migratory aquatic birds (5)
  23. 18d Farm outbuilding (4)