What am I?

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