Starchy foodstuff (4)
I believe the answer is:
sago
'starchy foodstuff' 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 "Powdery starch used in cooking" , "Powdery starchy food" , "Starchy grain used in desserts" , "Edible powdery starch" , "Palm cereal" .)