Deny profit, for example (7)
I believe the answer is:
gainsay
'deny' is the definition.
(I've seen this in another clue)
'profit for example' is the wordplay.
'profit' becomes 'gain' (synonyms).
'for example' becomes 'say' ('say' can be used to introduce an example).
'gain'+'say'='GAINSAY'
(Other definitions for gainsay that I've seen before include "Contradict, deny, dispute" , "Speak against" , "Challenge, dispute" .)