Crazy bunch, but handy (7)
I believe the answer is:
bananas
'crazy' is the definition.
(thesaurus)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for bananas that I've seen before include "off 27 [TROLLEY]" , "nutty" , "Mad - curved fruits" , "hands" , "Fruit - nuts" .)