Proof of purchase (7)

I think it could be either:

Which length description are you looking for?:

5,4

receipt

'proof of purchase' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for receipt that I've seen before include "Delivery" , "Confirmation of purchase" , "Getting" , "Record of payment" , "Evidence of sale" .)

I've seen this clue in The Mirror, The Guardian, The Times, the LA Times and The Star Tribune.

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