Crossword Genius

An error in the wage packet? (7)

Ross

I believe the answer is:

payslip

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'an error in' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'wage packet?' is the wordplay.
'wage' becomes 'pay' (synonyms).
'packet?' becomes 'slip' (I can't justify this - if you can you should give a lot more credence to this answer).
'pay'+'slip'='PAYSLIP'

'the' acts as a link.

Can you help me to learn more?

(Other definitions for payslip that I've seen before include "Detachable form accompanying cheque" , "Piece of paper accompanying remittance" , "Capital of Italy" , "Paper to accompany cheque" , "Record of wages earned" .)

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