NMP Cryptic

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Across
  1. 2. Meddle with fare and suffer frighteningly (4)
  2. 4. Smoked back to good health? (5)
  3. 5. One fifty fifty chance of being poorly (3)
  4. 6. Unpleasant feeling of nay exit (7)
  5. 9. Look forward to more but bleakly fail (8)
  6. 10. No one about, so yell on (6)
  7. 12. Was paradise before a disappearance led to misery (7)
  8. 14. Bewildered by trick primed to explode (8)
  9. 18. Take this before rapidly talking incoherently, so to speak (10)
  10. 19. Ruler of all evil going down (7)
  11. 20. Get out of dire row and feel uneasy (7)
Down
  1. 1. I tamed coins by prescribed means (11)
  2. 2. Successful but hot and bothered in the toilet (7)
  3. 3. Similar to, or perhaps as useful as, 1 down? (11)
  4. 7. Horribly scared to make a mistake at the twentieth letter (6)
  5. 8. Dark as a Scottish loch at midnight (9)
  6. 9. Horny chap I do not believe is unwell (12)
  7. 11. Spinning the ad brings a fact of life(5)
  8. 13. Out of calamity cometh serenity (4)
  9. 15. Not sure if this is the right word (11)
  10. 16. A dent or a dip is sad (10)
  11. 17. A guy I view as unstable (5)