Crossword Genius

Wrote in confinement (6)

Ross

I believe the answer is:

penned

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'wrote' is the definition.
('pen' can be a synonym of 'write')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for penned that I've seen before include "Put down" , "Wrote; enclosed" , "Wrote; confined" , "Confined; written" , "in Reading Gaol, perhaps" .)

I've seen this clue in The Irish Independent.
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