He's big in Westminster, very big in Scotland (3)

I believe the answer is:

ben

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'he's' is the definition.
(I've seen this in another clue)

I don't understand how the rest of the clue works.

(Other definitions for ben that I've seen before include "Scottish mountain peak" , "High mountain (Scots)" , "Mountain; man's name" , "Big . . . is a famous London clock-tower" , "Second part of 11" .)

I've seen this clue in the Evening Standard.

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