Charge for ring (4)
I believe the answer is:
toll
I believe this clue is a double definition.
'charge' is the first definition.
(toll is a kind of charge)
'for ring' is the second definition.
(a bell tolls)
(Other definitions for toll that I've seen before include "Charge (to use road)" , "Fee for road/bridge" , "Crossing fee" , "repeated ringing" , "Form of road tax" .)