Smart aleck (4-3)

I think it could be either:

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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 Telegraph, The Independent, The Mirror, The Wall Street Journal, The Guardian and The New York Times.

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