Complete
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7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a Small cut of beef from the underside of a sirloin (5,6)
  2. 7a Spot (4)
  3. 8a Pre-2001 name for Kolkata (8)
  4. 9a Eject (4,3)
  5. 11a Code for I (5)
  6. 13a Welsh for Wales (5)
  7. 14a Queens or Brooklyn, say, in New York (7)
  8. 16a Gorbachev's 1985 slogan involving more open government (8)
  9. 17a Connect (4)
  10. 18a Very gregarious type (5,6)
  11. 1d Strip the skin off (4)
  12. 2d Snooty (5-2)
  13. 3d (Of terrain) going up and down (5)
  14. 4d Suggestive implication (8)
  15. 5d High-jumping technique — ploy rubs off (anag) (7,4)
  16. 6d 1999 film starring Julia Roberts and Hugh Grant — West London district with an annual carnival (7,4)
  17. 10d Management of growing timber (8)
  18. 12d Omen (7)
  19. 15d Cyst (5)
  20. 17d Leap (4)