Starch tree (4)
I believe the answer is:
sago
'starch tree' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sago that I've seen before include "Starchy grain used in desserts" , "Powdery starchy food" , "Edible powdery starch" , "Starchy food as white pudding" , "Cereal, used in pudding" .)