Crossword Genius

Write from prison (3)

Ross

I believe the answer is:

pen

I believe this clue is a double definition.

'write' is the first definition.
(I know that write can be written as pen)

'prison' is the second definition.
(both can mean an enclosure)

'from' acts as a link.

(Other definitions for pen that I've seen before include "International Association of poets, playwrights etc" , "Cage - bird" , "Coop" , "See 20" , "Writing tool" .)

I've seen this clue in the Evening Standard.
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