Jekyll and Hyde: The Strange Case Cryptic Crossword

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Across
  1. 4. A character who has never been found out
  2. 6. May sound like this is used for swimming, but is it?
  3. 10. Evens in the middle of scrambled tons
  4. 12. The twentieth letter and juice containers have all been scrambled up
  5. 13. More plentiful and surrounded by design and technology scrambled
  6. 15. Ali is in duty
  7. 17. This person was scrambled inward
  8. 18. are surrounded by classwork
  9. 19. French "I" + murder
  10. 21. Form in the middle of a translation missing a letter
Down
  1. 1. The beginning 3 letters is enough to understand what this word is
  2. 2. Beginning of a classic board game and similar to fog
  3. 3. French cheese in the middle of shortened gallons
  4. 5. This, in a language, surrounds the rim
  5. 7. Add "a" and this becomes a plant. take away the middle letter and this becomes French for "to go up"
  6. 8. This name is often shortened by only the two letters around it
  7. 9. Human resources surround the scrambled tune
  8. 11. Vitamin acquired by sun exposure with a mat on the floor
  9. 14. Two names fused together
  10. 16. You're welcome in the middle of real reversed
  11. 20. New York is surrounded by scrambled loans