50.

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Across
  1. 1. Johnston, Mooney and O'Brien capable of making bloomers (6)
  2. 3. Capable of making hit out of corner of one's eyes (6)
  3. 4. TUBES Nuts out of box ___ they may contain chemicals (4,5)
  4. 8. Bitter compound extracted from bark and wood of tree of the same name (7)
  5. 10. Club -- one going down around start of recession (6)
  6. 13. 'The part of one's eye one might have tear in (6)'
  7. 14. PET Apple of one's eye
  8. 15. In the end, wrap up business for graduate out of tree? (6)
  9. 16. It might be seen out of the corner of one's eye
  10. 18. Given to jesting, Jack's out of one's eye (6)
  11. 19. Bit of tree, of book
Down
  1. 2. Out of the corner of one's eye (7)
  2. 5. Firework out of box - deer, turning tail, runs
  3. 6. Firm to earn differently from what's in front of one's eye (6)
  4. 7. Letter used by Tsipras ahead of recess rejecting eastern city
  5. 9. Capable of making fine distinctions
  6. 11. Expressions with figurative or peculiar meanings - "piece of cake", "bed of roses", "apple of one's eye" to name a few (6)
  7. 12. AT Touch lightly, as the corner of one's eye
  8. 17. A cicada, troubled, died falling out of tree (6)
  9. 20. Old, perhaps, but still capable of making scores (6)