Privates stealing bananas (8)
I believe the answer is:
genitals
'privates' is the definition.
('genitals' can be a synonym of 'privates')
'stealing bananas' is the wordplay.
'bananas' indicates anagramming the letters (informal term for mad).
'stealing' anagrammed gives 'GENITALS'.
I've seen this clue in The Guardian.
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