Answer: groucho

AnswerCrossword Clue
GROUCHORapid-fire Marxman.
GROUCHO"You Bet Your Life" host
GROUCHOJulius's stage name
GROUCHO"Animal Crackers" name
GROUCHOCigar-puffing TV wit
GROUCHOMemorable cigar smoker
GROUCHOWhom some novelty disguises imitate
GROUCHOThe mustachioed brother
GROUCHOJulius, familiarly
GROUCHO"Animal Crackers" wisecracker
GROUCHOMarx
GROUCHOZany comedian.
GROUCHO"I have had a perfectly wonderful evening, but this wasn't it" speaker
GROUCHOMustachioed comedian (first name).
GROUCHOMarx with a mustache
GROUCHO"... the one, the only, ...!"
GROUCHOBrother of Chico and Zeppo
GROUCHOFamous eyebrow lifter
GROUCHOBrother of Harpo
GROUCHOMustachioed Marx
GROUCHOMarx man?
GROUCHO"You Bet Your Life" quipster
GROUCHO"Those are my principles. If you don't like them I have others" speaker