Losing interest with scoffing bananas (9,3)

I believe the answer is:

switching off

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'losing interest with scoffing bananas' is the definition.
I can't tell whether this defines the answer.

'with scoffing bananas' is the wordplay.
'bananas' indicates anagramming the letters (bananas can informally mean crazy).
'with'+'scoffing'='withscoffing'
'withscoffing' with letters rearranged gives 'SWITCHING OFF'.

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I've seen this clue in The Telegraph.

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