Be smarter than winner? What do you think? (3,4,2)
I believe the answer is:
out with it
'what do you think?' is the definition.
(I've seen this before)
'be smarter than winner?' is the wordplay.
'be smarter than' becomes 'outwit' (I've seen this before).
'winner?' becomes 'hit' (both can mean a successful creative venture).
'outwit'+'hit'='OUT WITH IT!'
(Other definitions for out with it that I've seen before include "divulge information immediately!" , "Tell me quickly" , "Demand for comment" , "Say what's on your mind, don't suppress it" , "Say what you think" .)