What am I?

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Across
  1. 2. enlarge
  2. 4. suggest something as a basis
  3. 5. circumference
  4. 7. visualize
  5. 8. divine
  6. 10. examination
  7. 13. improvement
  8. 15. traditional
  9. 16. suddenly
  10. 17. digest
  11. 18. enclose
  12. 20. except for
  13. 21. a specialized part of a cell having some specific function
  14. 23. lure
  15. 24. ban
  16. 25. clay to make brick
Down
  1. 1. extricate, release something like gas in Chemistry from combination
  2. 3. relieve
  3. 6. hardship
  4. 9. amass
  5. 11. extension
  6. 12. intensely
  7. 14. corporation
  8. 19. a device used to make something explode
  9. 22. exclusive control