Ticket price sounds just (4)
I believe the answer is:
fare
'ticket price' is the definition.
(eg a bus fare)
'sounds just' is the wordplay.
'sounds' shows a homophone (sound like).
'just' becomes 'fair' (just can mean fair in the sense of showing justice).
'fair' sounds like 'FARE'.
(Other definitions for fare that I've seen before include "Transport charge" , "Taxi charge; food" , "Grip (of a tyre)" , "Paying passenger" , "Food, or price of bus ticket" .)