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 Thread-like structure in living cells carrying genetic information (10)
  2. 7a Queensland's capital (8)
  3. 8a Part of the mouth (4)
  4. 9a Gardener's shallow basket (4)
  5. 10a Rugby position (3,4)
  6. 12a At present — fetch Ron one (anag) (3,3,5)
  7. 14a Treacle (anag) — daughter of Agamemnon (7)
  8. 16a Bargain — short cut? (4)
  9. 19a Joint often used in dandling (4)
  10. 20a One of Shakespeare's tragedies (4,4)
  11. 21a Short leather trousers with braces (10)
  12. 1d Measure of gold purity (5)
  13. 2d Saviour (7)
  14. 3d An average (4)
  15. 4d Young plant (8)
  16. 5d One of the gifts brought by the Magi (5)
  17. 6d Border, Scotch or Welsh sheepdog (6)
  18. 11d A Native American people — coke here (anag) (8)
  19. 12d Crime, such as murder or arson (6)
  20. 13d Flummox (7)
  21. 15d Greek island, base of the Minoan civilisation (5)
  22. 17d Without bells and whistles (5)
  23. 18d Rainfall measurement unit (4)