Answer: liston

AnswerCrossword Clue
LISTONChamp before Ali
LISTONLoser to Clay in 1964
LISTONBeaten by Clay in 1964
LISTONHeavyweight Sonny
LISTONClay pounder?
LISTONClay target?
LISTONBoxer nicknamed "The Bear"
LISTONBoxer on the cover of "Sgt. Pepper's Lonely Hearts Club Band"
LISTONLoser to Ali
LISTONHeavyweight champ: 1962-64
LISTONLoser to Clay: 1964
LISTONTwo-time loser to Ali
LISTONEx-champ Sonny
LISTONHeavyweight champion, 1962-63.
LISTON'60s heavyweight champ
LISTONClay dethroned him
LISTONChamp dethroned in 1964
LISTONBoxer Sonny
LISTONFormer heavyweight champ Sonny
LISTONHis 1964 dethroning was a feat of Clay
LISTONClay foe of 1964