8.

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Across
  1. 4. IN One drip, oddly, may be involved
  2. 5. The food storage is in the cellar, Derek (6)
  3. 6. Driest of the sherries (4)
  4. 7. Are these places where they serve carbonated sherries to high flyers? (8)
  5. 8. Thus to return what's in the chimney (4)
  6. 11. Laughs at rid in returning what is sown (7)
  7. 13. Relatively rude boy drinks a sherry oddly (7)
  8. 15. Word that oddly can mean "good" in slang
  9. 16. At fair sherries flew perhaps. They go up and down and round and round (6,6)
  10. 17. Housebound granny's initial regret after a few sherries? (8)
  11. 18. The Ancient Mariner returns what is his to the chief (4)
  12. 20. Party piece not bad after fourth of sherries (9)
  13. 22. Revolutionary swallows number of sherries heartlessly with gangster (7)
  14. 23. Lead ingredients in ten of your sherry trifles (4)
Down
  1. 1. Pre-dinner sherries
  2. 2. It's found in some sherries cherished by university students produced by those selling Ros's? (8)
  3. 3. At fair sherries flew perhaps. They go up and down and round and round (6,6)
  4. 9. How we desire for Miss Derek to return! What a shape! (6)
  5. 10. Musical work and ballet oddly can be fixed in theatre (8)
  6. 12. Ask to return what is in the cellar deteriorating (6)
  7. 14. Plus-fours, used oddly, may possibly be unnecessary (11)
  8. 19. Sherries served regularly at secluded place, tranquil in extreme (8)
  9. 21. Figure drinking first of sherries, dry (7)
  10. 24. Sherries, oddly, can be (4)