Complete
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8 10 13 16 6 5 19 1 17 2 9 14 3 11 15 4 12 18 7
  1. 5a Greek dramatist, author of Oedipus Rex (9)
  2. 8a Metal, Au (4)
  3. 9a Tire oneself out (6,2)
  4. 10a Mad (6)
  5. 11a Flat-topped pieces of furniture (which can be turned?) (6)
  6. 13a Sand trap (6)
  7. 15a US state, capital Salem (6)
  8. 16a Suffered anguish (8)
  9. 18a Food fish related to the cod (4)
  10. 19a Stolen (9)
  11. 1d Refrain — restrain — retain (4,4)
  12. 2d Protective finish on motor vehicle fittings (6)
  13. 3d Take — consent (6)
  14. 4d Flex (4)
  15. 6d Lunar rover (4,5)
  16. 7d Pyrotechnics (9)
  17. 12d Leader of the USSR, 1977-82 (8)
  18. 14d Consequence (6)
  19. 15d South London theatre (3,3)
  20. 17d Substantive (4)