Taxi rider (4)
I believe the answer is:
fare
'taxi rider' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fare that I've seen before include "Charge for travelling on train or bus" , "Taxi hire cost" , "Food provided in fear" , "Grip (of a tyre)" , "Taxi charge; food" .)