Utter, Begone! to the palm starch (4)

I believe the answer is:

sago

I'm a little stuck... Click here to teach me more about this clue!

'palm starch' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for sago that I've seen before include "Starchy pudding cereal" , "Cereal, used in pudding" , "dessert?" , "Starchy food as white pudding" , "Edible palm starch" .)

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app