Organic bananas repelling Mr Munro? (5,4)

I believe the answer is:

cairn gorm

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'munro?' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'organic bananas repelling mr' is the wordplay.
'bananas' indicates an anagram (informal term for mad).
'repelling' shows that the letters should be reversed in order.
'mr' backwards is 'rm'.
'organic' is an anagram of 'cairngo'.
'cairngo'+'rm'='CAIRN GORM'

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