Crossword Genius

Word often accompanying name for cage (3)

Ross

I believe the answer is:

pen

This clue is a double definition.

'word often accompanying name' is the first definition.
(pen name)

'cage' is the second definition.
(thesaurus)

'for' is the link.

(Other definitions for pen that I've seen before include "See 20" , "Prison" , "Swan for the writer" , "Cage - bird" , "American jug?" .)

I've seen this clue in The Times.
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