Actor brother of Daniel, Stephen and William Baldwin (4)

I believe the answer is:

alec

(Other definitions for alec that I've seen before include "Smart ..., he thinks he knows everything" , "Sir - Douglas-Home, former PM" , "Guinness (a smart lad?)" , "Boy's name (a smart one?)" , "Actor Guinness is smart" .)

I've seen this clue in The Sun.

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