Palm starch (4)
I believe the answer is:
sago
'palm starch' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sago that I've seen before include "Edible palm starch" , "Starchy food as white pudding" , "Starchy grain used in desserts" , "Powdery starch used in cooking" , "dessert?" .)