Give back coupon as means of going home (6,6)
I believe the answer is:
return ticket
'means of going home' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'give back coupon' is the wordplay.
'give back' becomes 're-turn' (synonyms).
'coupon' becomes 'ticket' (I can't explain this - if you can you should give a lot more credence to this answer).
'return'+'ticket'='RETURN TICKET'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for return ticket that I've seen before include "There-to-here guarantee?" , "Voucher for journey back" , "Two-way journey pass" , "Homeward passage" , "No single" .)