Smart alec (4-2-3)
'smart alec' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for wiseacre that I've seen before include "Smart Aleck" , "One claims to know all" , "upstart" , "Person with an affectation of wisdom" , "Show-off" .)
'smart alec' is the definition.
(both can mean an annoyingly clever person)
This is the entire clue.
(Other definitions for know-all that I've seen before include "Self-styled polymath" , "Pedantic" , "Wise guy" , "One supposedly omniscient" , "He always has answer" .)
'smart alec' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for know-it-all that I've seen before include "Unteachable bigot" , "Smart alec" .)