Some bananas left next to the French wine (7)
I believe the answer is:
moselle
'wine' is the definition.
(Moselle is an example)
'some bananas left next to the french' is the wordplay.
'bananas' is an anagram indicator (informal term for mad).
'left' becomes 'l' (common abbreviation**).
'next to' says to put letters next to each other.
'the french' becomes 'le'.
'some' with letters rearranged gives 'mose'.
'mose'+'l'+'le'='MOSELLE'
(Other definitions for moselle that I've seen before include "Fr. river, department; German wine" , "River; white wine" , "French or German white wine" , "French department" , "Light white wine" .)