Crossword Genius

Like a know-it-all (4)

Ross

I believe the answer is:

smug

(Other definitions for smug that I've seen before include "Twisted; quirky" , "goody-goody" , "Irritatingly pleased with oneself" , "Unpleasantly complacent" , "Unctuous" .)

I've seen this clue in the Universal.
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