Get assistance with profits - that's denied (8)
I believe the answer is:
gainsaid
'denied' is the definition.
(to gainsay is to deny or dispute something)
'get assistance with profits' is the wordplay.
'get assistance' becomes 'aid' (I am not sure about this - if you are sure you should believe this answer much more).
'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'.
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for gainsaid that I've seen before include "Formally denied or contradicted" , "Challenged" .)