Big Ben (5)

I believe the answer is:

nevis

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'ben' is the definition.
(I have seen 'Highest Ben' mean 'nevis' so perhaps 'ben' could also mean 'nevis')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for nevis that I've seen before include "Ben -, highest British mountain" , "The principal ben" , "Ben -, highest Br. spot" , "Ben ..... is highest mountain in Britain" , "Island" .)

I've seen this clue in the Canadiana and the Evening Standard.

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