Not a fair copy (4)

I believe the answer is:

crib

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'copy' is the definition.
(crib can mean to copy from another source)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for crib that I've seen before include "A model of the manger" , "Poor translation" , "Bed; manger" , "24 ac" , "urban dwelling" .)

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

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