Profits from rail tickets (7)
I believe the answer is:
returns
I believe this clue is a double definition.
'profits' is the first definition.
(I've seen this before)
'rail tickets' is the second definition.
'from' is the link.
(Other definitions for returns that I've seen before include "Goods sent back" , "profit" , "Tickets possibly available" , "Profits" , "Throws made by cricketers" .)