Profit sometimes taken unfairly? (9)
I believe the answer is:
advantage
'profit' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for advantage that I've seen before include "Edge, head start" , "Privilege" , "More favorable position" , "Benefit - superior position" , "Use" .)