Cuts ripe bananas for dessert topping (3,5)
I believe the answer is:
pie crust
'dessert topping' is the definition.
(a pie crust might top a dessert)
'cuts ripe bananas' is the wordplay.
'bananas' indicates an anagram (informal term for mad).
'cuts'+'ripe'='cutsripe'
'cutsripe' is an anagram of 'PIE CRUST'.
'for' is the link.
(Other definitions for pie crust that I've seen before include "baked pastry" , "that might appear on The Great British Bake Off" .)