Crossword Genius

Documents reporter's income for each piece (9)

Ross

I believe the answer is:

paperwork

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

'piece' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'documents reporter's income for each' is the wordplay.
I cannot really see how this works, but
'each' could be 'per' ('per' can mean for each) and 'per' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.
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