Complete
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  1. 1a North-east London borough — Streatham flow (anag) (7,6)
  2. 8a Small secluded room (4)
  3. 9a Crook (8)
  4. 10a Be in charge (3,3,4)
  5. 12a Spotted feline of Central and South America (6)
  6. 14a Being nosy (6)
  7. 15a Father Brown's creator (10)
  8. 19a Jack-of-all-trades? (8)
  9. 20a UK sports betting company (4)
  10. 21a Kitchen gadget with interchangeable blades (4,9)
  11. 2d Proclaim (8)
  12. 3d Blotto (5)
  13. 4d Like Samuel Taylor Coleridge's mariner? (7)
  14. 5d Trust (5)
  15. 6d Great Western, say (7)
  16. 7d Pole to support sails or rigging (4)
  17. 11d Not many (3,2,3)
  18. 13d Found (7)
  19. 14d Washington DC's river (7)
  20. 16d Come on stage (5)
  21. 17d Religious observances (5)
  22. 18d County on the west coast of Ireland (4)