Paying passengers (5)
I believe the answer is:
fares
'paying passengers' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fares that I've seen before include "Charges for bus or train rides" , "Charges for public vehicles" , "Taxi passengers" , "Moneys paid to ride on train or bus" , "Gets on" .)