Tell me unfashionable comedian gets success (3,4,2)
I believe the answer is:
out with it
'tell me' is the definition.
(I've seen this before)
'unfashionable comedian gets success' is the wordplay.
'unfashionable' becomes 'out' (synonyms).
'comedian' becomes 'wit' (a witty person).
'gets' says to put letters next to each other.
'success' becomes 'hit' (a hit is a commercial success).
'out'+'wit'+'hit'='OUT WITH IT!'
(Other definitions for out with it that I've seen before include "divulge information immediately!" , "Demand for comment" , "Go on" , "Speak up" , "Stop hesitating!" .)