Crossword Genius

A writer put in prison (3)

Ross

I believe the answer is:

pen

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

This clue might be a double definition.

'a writer' is the first definition.
(something which writes)

'in prison' is the second definition.
'pen' can be an answer for 'prison' (both can mean an enclosure). I am unsure of the 'in' bit.

'put' is the link.

Can you help me to learn more?

(Other definitions for pen that I've seen before include "Cage - bird" , "Shut up" , "Small enclosure" , "Pound" , "dash off" .)

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