Answer: wiseguy

AnswerCrossword Clue
WISEGUY

Smart aleck

WISEGUY

Mouthy sort

WISEGUY

He knows all the answers.

WISEGUY
Smart aleck.
WISEGUY
Know-it-all.
WISEGUYKnow-it-all
WISEGUYFlippant fellow
WISEGUYMafia member