Oliver

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Across
  1. 3. Roman five
  2. 5. lack of harmony
  3. 12. *city-slickers bred to never lose their way
  4. 13. mythy fantasy novel named after its central accusation
  5. 15. *womens' soap brand
  6. 16. duality concept
  7. 17. Jesse's partner-in-trouble-doubling
  8. 19. a division
  9. 23. female Gorilla?
  10. 25. girls to british rockers, or the starred clues
  11. 27. *Arctic Emperor
Down
  1. 1. centurions, samurai, e.g.
  2. 2. image size, or a commitment
  3. 4. UK ice cream, or comedy trilogy
  4. 6. rapper's pet?
  5. 7. boomer slang for a kiddo, or 21-down 20-down hero
  6. 8. pen's lesser, supposedly
  7. 9. Babar species
  8. 10. NFL equivalent of 1-down and 20-down
  9. 11. divisive oil-bearing fruit, ironically
  10. 14. "Acid Rap" ad-lib
  11. 18. UK loyalist, or spy trilogy
  12. 20. fantasy creatures named for their size
  13. 21. hookup metaphor sport
  14. 22. interchangeable with disintegrators, to super-villains
  15. 24. sometimes steamed in bamboo baskets
  16. 26. activity of 1-down "Brothers" duo