Smart aleck (4-3)

I think it could be either:

Which length description are you looking for?:

4-2-3

4-3

know-all

'smart aleck' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for know-all that I've seen before include "One who thinks they have all the answers" , "Clever clogs!" , "One supposedly omniscient" , "Boastful person who behaves like repository of information" , "Self-styled polymath" .)

I've seen this clue in The Mirror, The Independent, The Guardian, The Telegraph, The New York Times and The Wall Street Journal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.