What might cause boom to trade on bananas (9)
I believe the answer is:
detonator
'what might cause boom' is the definition.
I can't judge whether this definition defines the answer.
'to trade on bananas' is the wordplay.
'bananas' indicates an anagram (informal term for mad).
'to'+'trade'+'on'='totradeon'
'totradeon' anagrammed gives 'DETONATOR'.
Can you help me to learn more?
(Other definitions for detonator that I've seen before include "Part of bomb" , "That has explosive effect" , "this will cause an outburst" , "cap" , "Explosive initiator" .)