Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Edible mollusc with a ribbed shell (6)
  2. 4a Luxurious — soft material (5)
  3. 7a Card game for two (6)
  4. 8a Macbeth's victim (6)
  5. 9a Tied agricultural worker in feudal times (4)
  6. 10a That's nonsense! (8)
  7. 12a Reminder (4-7)
  8. 17a Potential sequence of events (8)
  9. 19a Office worker's usual finishing time? (4)
  10. 20a Lacking in power (6)
  11. 21a Fervent partisan (6)
  12. 22a Dine at home (3,2)
  13. 23a Celebrations (6)
  14. 1d Unrealistic hope — ie charm (anag) (7)
  15. 2d Thrilled to bits (informal) (7)
  16. 3d Merlot ace (anag) — a recent arrival (9)
  17. 4d Examine in great depth (5)
  18. 5d Opaque (7)
  19. 6d That's the truth! (6)
  20. 11d Hoodwink (9)
  21. 13d Approximate (7)
  22. 14d Exaggerate — blow up (7)
  23. 15d Covetous (7)
  24. 16d Take to be the case (6)
  25. 18d Exhausted (3,2)