Crossword Genius

Smart ---, know-all (4)

Ross

I believe the answer is:

alec

(Other definitions for alec that I've seen before include "Smart ..., he thinks he knows everything" , "A smart . . . . is a know-all in lace" , "Sir - Douglas-Home, former PM" , "Smart boy?" , "Smart chap" .)

I've seen this clue in The Times.
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