Answer:

SMARTY

Answer	Crossword Clue
SMARTY	Know-it-all
SMARTY	Wisenheimer
SMARTY	Wiseacre

SMARTY	2004 Kentucky Derby winner .. Jones
SMARTY	...-pants
SMARTY	Pants opening
SMARTY	2004 Kentucky Derby winner ... Jones
SMARTY	Wise guy
SMARTY	Wise guy sometimes "wearing" pants?
SMARTY	Grandstander
SMARTY	Callow person who tries to be witty: slang.

SMARTY	Juvenile song-title.
SMARTY	Pseudo-humorous person.
SMARTY	Wise aleck.
SMARTY	Would-be wit: Slang.
SMARTY	Child's epithet.
SMARTY	Objectionable Aleck.
SMARTY	Show-off.
SMARTY	Know-it-all.

SMARTY	Kind of pants
SMARTY	...-pants (wise guy)
SMARTY	Person who mouths off
SMARTY	Big mouth!
SMARTY	Cocky chap
SMARTY	...pants: wiseguy