Crossword Genius

Transaction which is without credit (4,4)

Ross

I believe the answer is:

cash sale

I'm a little stuck... Click here to teach me more about this clue!

'is without credit' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'transaction' is the wordplay.
I cannot quite see how this works, but
'transaction' could be 'sale' (sales are a type of transaction) and 'sale' is present in the answer.
The remaining letters 'cash' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'which' is the link.

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I've seen this clue in The Globe and Mail.
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