Feed bananas, if sterile (9)

I believe the answer is:

fertilise

'feed' is the definition.
(I know that feed can be written as fertilise)

'bananas if sterile' is the wordplay.
'bananas' is an anagram indicator (informal term for mad).
'if'+'sterile'='ifsterile'
'ifsterile' with letters rearranged gives 'FERTILISE'.

I've seen this clue in The Daily Express.

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