Crossword Genius

Smartypants (4-3)

Ross

I believe the answer is:

know-all

(Other definitions for know-all that I've seen before include "One who thinks they have all the answers" , "Person who thinks he has all the answers" , "Smarty-pants" , "Smart alec" , "Pretender to great learning" .)

I've seen this clue in The Telegraph.
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