Bank reversed charge, right (4)
I believe the answer is:
reef
'bank' is the definition.
(I've seen this before)
'reversed charge right' is the wordplay.
'reversed' says the letters should be written backwards.
'charge' becomes 'fee' (fee is a kind of charge).
'right' becomes 'r' (common abbreviation).
'fee'+'r'='feer'
'feer' reversed gives 'REEF'.
(Other definitions for reef that I've seen before include "Free (anag.)" , "Rocks in shallow water - kind of knot" , "sailors consider dangerous" , "Hazard for ships" , "Submerged ridge near the surface of the sea" .)