Fish bringing in right money (5)
I believe the answer is:
brass
'money' is the definition.
(I've seen this before)
'fish bringing in right' is the wordplay.
'fish' becomes 'bass' (bass is a kind of fish**).
'bringing in' indicates putting letters inside.
'right' becomes 'r' (common abbreviation).
'bass' placed around 'r' is 'BRASS'.
(Other definitions for brass that I've seen before include "some players!" , "Metal alloy" , "Alloy (associated with muck)" , "Boldness" , "Alloy; effrontery" .)