Crossword Genius

There's no return on this voucher (6,6)

Ross

I believe the answer is:

single ticket

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'there's' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'no return on this voucher' is the wordplay.
'no return' becomes 'single' (I can't justify this - if you can you should give a lot more credence to this answer).
'on' means one lot of letters go next to another.
'this voucher' becomes 'ticket' (I've seen this before).
'single'+'ticket'='SINGLE TICKET'

Can you help me to learn more?

I've seen this clue in The Irish News.
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