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 Do this and rule? (6)
  2. 4a Collection of stamps, say (5)
  3. 7a Eat outdoors (6)
  4. 8a One's work is entirely bogus (6)
  5. 9a Occupy all available space (4)
  6. 10a Third level (8)
  7. 12a Coppers (5,6)
  8. 17a Emblem of official position (8)
  9. 19a Kind of ferry (informal) (2-2)
  10. 20a Stumble (4,2)
  11. 21a Broad area (6)
  12. 22a Extract metal from its ore with heat (5)
  13. 23a Articulate (6)
  14. 1d Small patterned mats put on a plate under cakes etc (7)
  15. 2d Conventional — flavour (7)
  16. 3d Olympic event consisting of four runs, three jumps and three throws (9)
  17. 4d Espouse (5)
  18. 5d A theory about the origin of the universe (3,4)
  19. 6d Burn at the stake (6)
  20. 11d Dramatic practice? (9)
  21. 13d ie firms (anag) — go wrong (7)
  22. 14d Tell a tale (7)
  23. 15d Audible distance (7)
  24. 16d Fixed unnatural smile (6)
  25. 18d Swinish sound (5)