Crossword Genius

Writer of silent work shut up (4)

Ross

I believe the answer is:

cage

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'shut up' is the definition.
(I've seen this in other clues)

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

Can you help me to learn more?

(Other definitions for cage that I've seen before include "Prison (with bars)" , "Put in prison" , "Nicolas - - (films)" , "Enclose with bars" , "he used to write down scores" .)

I've seen this clue in The Times.
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