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 Same here! (4,3,4)
  2. 7a Unfriendly giant (4)
  3. 8a Meet (8)
  4. 9a Stranded (7)
  5. 11a Disjointed (5)
  6. 13a Police informer — baccy (5)
  7. 14a Member of a band of robbers (7)
  8. 16a Half-hearted (8)
  9. 17a Personal belongings (4)
  10. 18a Shrewd — a PhD twister (anag) (5-6)
  11. 1d Dossier (4)
  12. 2d In a pile (7)
  13. 3d Seedless and flowerless green plants (5)
  14. 4d Short-lived (8)
  15. 5d Massive things that threaten to crush everything their way (11)
  16. 6d Run-of-the-mill (3-8)
  17. 10d Raised track across water or marshland (8)
  18. 12d Supposed source of technical glitches (7)
  19. 15d Florida resort on the Gulf of Mexico (5)
  20. 17d Intestines — backbone (4)