Carry on making endless profits (7)
I believe the answer is:
proceed
'carry on' is the definition.
(synonyms)
'endless profits' is the wordplay.
'endless' means to remove the last letter.
'profits' becomes 'proceeds' (I've seen this before).
'proceeds' with its last letter taken away is 'PROCEED'.
'making' acts as a link.
(Other definitions for proceed that I've seen before include "Continue, go ahead" , "Go forward" , "Continue, carry on" , "Move forward" , "Follow a certain course" .)