Is she prohibited from entering outer Brentford? (4)

I believe the answer is:

anne

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

I don't understand the remainder of the clue.

(Other definitions for anne that I've seen before include "English queen" , "The Princess Royal" , "First name of two of Henry VIII's wives" , "- - Hathaway, wife of Shakespeare" , "One of Henry VIII's wives" .)

I've seen this clue in the Evening Standard.

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