Profit greatly in contest, keeping in shape? (5,2)
I believe the answer is:
clean up
'profit' is the definition.
(thesaurus)
'greatly in contest keeping in shape?' is the wordplay.
'greatly in contest keeping' becomes 'lean' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'in' is an insertion indicator.
'shape?' becomes 'cup' (cup is a kind of shape).
'lean' placed into 'cup' is 'CLEAN-UP'.
Can you help me to learn more?
(Other definitions for clean up that I've seen before include "Make tidy" , "free of filth" , "emulate Bowdler" , "Make a great profit" , "Thorough decontamination" .)