Return ticket maybe for part of Australia (7)
I believe the answer is:
outback
This might be a double definition.
'return ticket' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'for part of australia' is the second definition.
(the Australian outback)
'maybe' is the link.
(Other definitions for outback that I've seen before include "Remote Australian area" , "Remote areas of Australia" , "Remote part of Australia" , "Australian bush country" , "remote region" .)