Pursuit of profit (8)
I believe the answer is:
interest
This clue is a double definition.
'pursuit' is the first definition.
(I've seen this before)
'profit' is the second definition.
(I've seen this before)
'of' is the link.
(Other definitions for interest that I've seen before include "Deep concern - premium paid for use of money" , "Money made by or paid for money" , "earnings" , "Charge or payment for the use of money" , "Sum paid on a loan" .)