A very intriguing puzzle (ee)

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Across
  1. 3. to move the steering wheel to change direction (especially of a vehicle)
  2. 4. The inside of something
  3. 5. A very annoying sound a specific person makes.
  4. 8. a very fine or diaphanous fabric or article.
  5. 14. to make a serious or urgent request.
  6. 15. yours _ _ _ _ _ _ _ _ _ A common letter end
  7. 16. Big plant.
  8. 17. Difficulty of geometry dash.
  9. 18. _ _ _ _ _ _ stickman. Also the final boss of the stickman series before it was ditched.
  10. 21. Element compound of the 51st element and 3 of the 14th element.
Down
  1. 1. Just guess this.
  2. 2. to be barely visible
  3. 6. An element between 56 and 60 electrons.
  4. 7. A very annoying insect that stings you.
  5. 9. Spoil or ruin an agreement or event
  6. 10. Opposite of a word with 2 pronunciations (British and American)
  7. 11. A good surprise.
  8. 12. to do something in a way that isn't easily seen or detected.
  9. 13. Guilty of deceit.
  10. 19. not genuine
  11. 20. filled with intense but unexpressed anger (of a person)