Highway fee (4)
I believe the answer is:
toll
'highway fee' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for toll that I've seen before include "Charge for passage" , "Charge for using, eg, road" , "Sum payable to use main road (4)" , "Fee paid for use of a public road" , "Tax for using a service" .)