Bank charge overturned following resistance (4)
I believe the answer is:
Here is my best explanation:
'bank' is the definition.
'charge overturned following resistance' is the subsidiary indication.
'charge' becomes 'fee' (fee is a kind of charge).
'overturned' says the letters should be written backwards.
'following' means one lot of letters go next to another.
'resistance' becomes 'r' (abbreviation).
'fee' back-to-front is 'eef'.
'eef' put after 'r' is 'reef'.
(Other definitions for reef that I've seen before include "Sandbank", "Free (anag.)", "A submerged ridge of rock", "key", "Main bank", "Rock formed of coral", "Coral outcrop", "The Great Barrier ..., Australian natural wonder", "marine hazard" and "Gather up".)