Chocolate bean (5)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
cacao
'chocolate bean' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cacao that I've seen before include "Tree supplying chocolate" , "Tropical tree, the source of chocolate" , "Tree from which chocolate is made" , "Plant" , "Bean providing chocolate" .)