Find another seat for listener with proof of payment (7)
I believe the answer is:
receipt
'proof of payment' is the definition.
(I've seen this before)
'find another seat for listener' is the wordplay.
I cannot really see how this works, but
'another' could be 're' (I've seen this in other clues) and 're' is found in the answer.
This explanation may well be incorrect...
'with' is the link.
Can you help me to learn more?
(Other definitions for receipt that I've seen before include "Delivery" , "Perhaps slip" , "Written or printed acknowledgement or payment" , "Written acknowledgment of payment" , "voucher" .)