Chocolate maker's tree (5)
I believe the answer is:
cacao
'chocolate maker's tree' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for cacao that I've seen before include "Tree yielding chocolate" , "Plant" , "Tree with seeds used to make chocolate" , "Tree supplying chocolate" , "Tropical tree, the source of chocolate" .)