Bananas' seeds (4)
I believe the answer is:
nuts
I believe this clue is a double definition.
'bananas'' is the first definition.
(as in crazy)
'seeds' is the second definition.
(nut is a kind of seed)
(Other definitions for nuts that I've seen before include "'Here we go gathering . . . . In May'" , "Crazy; food" , "Hard shells with edible kernels" , "Crackers - or what crackers are required for?" , "Bolt securers" .)