Tree from which chocolate is made (5)
I believe the answer is:
cacao
'tree from which chocolate is made' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for cacao that I've seen before include "Tree for cocoa bean" , "Tree supplying chocolate" , "Bean providing chocolate" , "Tree yielding chocolate" , "Tropical tree, the source of chocolate" .)