12.

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Across
  1. 5. Chlorpromazine, a tranquillising drug (9)
  2. 7. The part a rabbit can"t be without (3)
  3. 8. Beatrix's rabbit may fade away without (5)
  4. 10. It takes a good artist to produce such a jewelled piece (5)
  5. 11. It needs a heart of clay to produce such a tardy ceremony! (8)
  6. 13. Half of oxygen may produce such a shape (10)
  7. 14. How rabbit may taste
  8. 16. Neckwear with a man's business suit
  9. 17. Woman's name that's an anagram of a man's name
  10. 19. Girl's name, one letter short of a man's name
  11. 20. WAY TO Words with "a man's heart"
Down
  1. 1. A true rabbit can produce such a sedative drug
  2. 2. BARRELLED Like a shotgun wedding to produce such a name?
  3. 3. Woman's name in English that's a man's name in Catalan
  4. 4. Woman turning up with a man's statistical chart
  5. 6. It's a sharp one who can produce such embroidery
  6. 9. Where a rabbit may be hidden
  7. 12. PAIRS OF PANTS They came with a man's suit, once
  8. 15. One day with English queen swilling tea's enough (8)
  9. 18. Travels everywhere return on one day with dancer's boss (5)