Unskilled writer to suffer (4)

I believe the answer is:

hack

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'unskilled writer' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for hack that I've seen before include "mediocre writer" , "Crude cutting" , "Cut - mediocre journalist" , "get information illegally" , "Cut crudely - journalist" .)

I've seen this clue in The Sun.

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