Cash-crop estate needs to separate discarded fruit (8)
I believe the answer is:
plantain
'fruit' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for plantain that I've seen before include "Pal at inn (anag)" , "Sort of banana" , "Tropical plant like a banana" , "Low-growing plant; type of banana" , "Cooking banana" .)