Crossword Genius

Invoice in pouch-like holder, with penny change (6)

Ross

I believe the answer is:

docket

'invoice' is the definition.
(document listing a package's contents)

I don't understand the remainder of the clue.

(Other definitions for docket that I've seen before include "Voucher" , "Label or note that comes with a package" , "Certificate, label" , "Consignment paperwork" , "Counterfoil" .)

I've seen this clue in The Guardian.
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