Give back profit (6)
I believe the answer is:
return
I believe this is a double definition.
'give back' is the first definition.
('return' can be a synonym of 'give back')
'profit' is the second definition.
(I've seen this before)
(Other definitions for return that I've seen before include "Such a ticket brings you back" , "get back to original state" , "Take back" , "Come back; profit" , "Two-way ticket" .)