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 Joyless (6)
  2. 4a Departure (5)
  3. 7a Rectangular two-dimensional figure (6)
  4. 8a Soundless (6)
  5. 9a Curved structure (4)
  6. 10a Right to vote (8)
  7. 12a Royal residence in Norfolk (11)
  8. 17a Pickpocket — set up cru (anag) (8)
  9. 19a Edges (4)
  10. 20a Hearsay (6)
  11. 21a Inside (6)
  12. 22a Industrial centre of the Ruhr (5)
  13. 23a Simple calculating device (6)
  14. 1d Residential districts of town (7)
  15. 2d Medium-sized, blackish aquatic bird with long toes (7)
  16. 3d Hospital doctor (9)
  17. 4d Intense sorrow (5)
  18. 5d Japanese art of flower-arranging (7)
  19. 6d Channel running along the eaves of a building (6)
  20. 11d Large venomous Australian spider (6-3)
  21. 13d Occasionally (2,5)
  22. 14d Person in conflict with Roman Catholic dogma (7)
  23. 15d Published reminiscences (7)
  24. 16d Not enough to satisfy demand (6)
  25. 18d Reversal of direction (1-4)