What travellers pay for food (4)
I believe the answer is:
fare
'food' is the definition.
(fare is a kind of food)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for fare that I've seen before include "Get on - passenger - provisions" , "Payment for journey" , "Charge for travelling on train or bus" , "going rate?" , "Price of passage" .)