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 Participating (7,2)
  2. 8a Root vegetable producing sugar (4)
  3. 9a Something left out (8)
  4. 10a Act like a parasite (6)
  5. 11a Mediterranean island (6)
  6. 13a Handsome youth (6)
  7. 15a Solidified lava used as an abrasive (6)
  8. 16a Formal midday meal (8)
  9. 18a State of great agitation (4)
  10. 19a Madame in a Puccini opera (9)
  11. 1d Begin to understand (6,2)
  12. 2d Tom, Dick or Harry? (6)
  13. 3d Escargots (6)
  14. 4d Young goats (4)
  15. 6d Lent a hand (6,3)
  16. 7d Unruffled — brought together (9)
  17. 12d Woman's loose-fitting undergarment (8)
  18. 14d Afternoon rest (6)
  19. 15d Extreme poverty (6)
  20. 17d Pal (4)