Complete
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1 8 10 13 16 20 22 2 3 9 19 17 4 15 14 5 12 11 6 21 7 18
  1. 1a Pig's ear — a dreadful mess (informal) (4,9)
  2. 8a Wow! (informal) (3)
  3. 9a What pirates made one walk as a lethal punishment (9)
  4. 10a Andalusian Gypsy dance (8)
  5. 11a Lower part of an inside wall (4)
  6. 13a Strange thing (6)
  7. 14a Warhol's kind of painting (3,3)
  8. 16a Gloomy — black — hidden (4)
  9. 17a Enduring (8)
  10. 20a Pork and beef sausage (9)
  11. 21a Bird's reproductive body (3)
  12. 22a Aggressive contestant, willing to use underhand methods — register theft (anag) (6,7)
  13. 1d Unstimulating robusta drink (informal) (5)
  14. 2d Thoroughly (4,3,6)
  15. 3d Long loaf (8)
  16. 4d Ineffective person, lacking force or power (6)
  17. 5d Maintained (4)
  18. 6d Dry plateau, west of the Andes — a mad estate car (anag) (7,6)
  19. 7d Remove — kill (4,3)
  20. 12d Very tall (8)
  21. 13d Mythical king of Thebes, who unknowingly killed his father and married his mother (7)
  22. 15d Piece of confidential information (3-3)
  23. 18d Sweetener (5)
  24. 19d Brazil's most famous footballer (4)