Rising writer's enclosure (7)

I believe the answer is:

bullpen

'enclosure' is the definition.
(I've seen this before)

'rising writer's' is the wordplay.
'rising' becomes 'bull' (similar in meaning).
'writer' becomes 'pen' (something which writes).
'bull'+'pen'='BULLPEN'

(Other definitions for bullpen that I've seen before include "enclosure" , "American can" .)

I've seen this clue in the Sydney Morning Herald.

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