"Smart" guy (4)

I think it could be either:

Which length description are you looking for?:

alec

'smart guy' is the definition.
(as in the phrase 'smart Alec')

This is the entire clue.

(Other definitions for alec that I've seen before include "Actor Guinness is smart" , "Sir -- Guinness, actor" , "Smart chap" , "Boy's name (a smart one?)" , "Smart man?" .)

I've seen this clue in The Mirror, The New York Times and the Universal.

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