Type of banana (8)
I believe the answer is:
plantain
'type of banana' is the definition.
(I know that plantain is a type of banana)
This is all the clue.
(Other definitions for plantain that I've seen before include "Green-skinned banana" , "Cooking banana" , "Sort of banana" , "Low-growing plant; type of banana" , "Tropical plant like a banana" .)