Answer: champ

AnswerCrossword Clue
CHAMP... at the bit.
CHAMPJoe Louis.
CHAMPJames Beauchamp Clark (1850-1921).
CHAMPCharles, for instance.
CHAMPSugar Ray's title.
CHAMPRocky Marciano.
CHAMPBobo Olson.
CHAMPTop heavyweight's title.
CHAMPThe "winnah."
CHAMPBite and chew noisily.
CHAMPMunch.
CHAMPBelted belter
CHAMPBite with force and noise.
CHAMPWinner: Colloq.
CHAMPNo. 1 athlete
CHAMPDempsey, at one time
CHAMPNo. 1 person
CHAMPTop banana
CHAMPTop banana, athletically
CHAMPBest of the boxers
champto betray impatience, as to begin some action
CHAMPTitleholder, briefly
CHAMPTop dog
CHAMPRing leader?
CHAMPTitleholder
CHAMPWinner
CHAMPKing of the hill
CHAMPContender's target
CHAMPOne who's number one
CHAMPVictor
CHAMP... at the bit
CHAMPCreed, In "Rocky"
CHAMPBig winner
CHAMPTitle holder
CHAMPTrophy winner
CHAMPRing king
CHAMPCup bearer
CHAMPFirst-prize recipient
CHAMPTourney winner
CHAMPFirst-prize winner