Crossword Genius

They're edible, like bananas (4)

Ross

I believe the answer is:

nuts

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'bananas' is the definition.
(as in crazy)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nuts that I've seen before include "Crazy (sl.)" , "'Here we go gathering . . . . In May'" , "Got a screw loose" , "One eats these" , "Bolt securers" .)

I've seen this clue in the Evening Standard.
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