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 Wrongdoer (10)
  2. 7a Table tennis (4-4)
  3. 8a 6 June 1944 (1-3)
  4. 9a Pen-name of essayist Charles Lamb (4)
  5. 10a Clients (anag) (7)
  6. 12a 'I'm sorry to say …' (11)
  7. 14a French car company, founded in 1919 (7)
  8. 16a Football position (4)
  9. 19a A blocking vote (4)
  10. 20a The 'naughty' decade of Victorian Britain (8)
  11. 21a Author of The Picture of Dorian Gray (5,5)
  12. 1d New England state (5)
  13. 2d Falling behind (7)
  14. 3d Labour Party leader, 1980-83 (4)
  15. 4d Ponder (8)
  16. 5d ___ Nash, American poet, d. 1971 (5)
  17. 6d Kin (6)
  18. 11d Periods of 10 years — ie canned (anag) (8)
  19. 12d Elevated (6)
  20. 13d City on the River Avon (7)
  21. 15d Acts of public violence (5)
  22. 17d Freshwater diving bird (5)
  23. 18d Falling flakes (4)