The Greatest Boxer of the 20th Century

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Across
  1. 6. Cassius Clay's middle name
  2. 7. ( has an apostrophe in the answer) Disease that most boxers get because of boxing
  3. 9. The answer is in the title, and this is what Muhammed Ali's nickname was
  4. 11. What was Cassius Clay's nickname before he won the heavyweight title ?
  5. 13. Result of repeated hits to the brain
Down
  1. 1. ( Smokin' Joe is his nickname) The boxer that beat Cassius for the world heavyweight title in 1971
  2. 2. The guy that Cassius Clay beat for the heavyweight title in 1964
  3. 3. How many years was Cassius Clay banned from boxing for ?
  4. 4. Cassius Clay's Muslim name
  5. 5. State that Cassius Clay was born in
  6. 8. ( has a hyphen in the answer ) How old was Cassius Clay when he died ?
  7. 10. The War that Cassius was drafted into
  8. 12. Cassius's hometown