Heated raw bananas with Frenchman (4)
I believe the answer is:
warm
'heated' is the definition.
(thesaurus)
'raw bananas with frenchman' is the wordplay.
'bananas with' is an anagram indicator (informal term for mad).
'frenchman' becomes 'm' (abbreviation for Monsieur - like 'Mr').
'raw' with its letters anagrammed with 'm' can make 'WARM'.
(Other definitions for warm that I've seen before include "Affectionate - balmy" , "Animated" , "Slightly hot" , "Approaching target" , "not cool?" .)