Denied needing help with profits (8)
I believe the answer is:
gainsaid
'denied' is the definition.
(I've seen this before)
'help with profits' is the wordplay.
'help' becomes 'aid' ('aid' can be a synonym of 'help').
'with' means one lot of letters go next to another.
'profits' becomes 'gains' ('gain' can be a synonym of 'profit').
'aid' after 'gains' is 'GAINSAID'.
'needing' acts as a link.
(Other definitions for gainsaid that I've seen before include "Formally denied or contradicted" , "Challenged" .)