Profit from ticket (6)
I believe the answer is:
return
I believe this is a double definition.
'profit' is the first definition.
(I've seen this before)
'ticket' is the second definition.
(return ticket is a kind of ticket)
'from' is the link.
(Other definitions for return that I've seen before include "Comeback" , "Send/come back" , "second half of journey" , "Interest" , "Key on computer" .)