It's used as a food thickener (4)

I believe the answer is:

sago

(Other definitions for sago that I've seen before include "Palm cereal" , "Powdery starchy food" , "Starchy cereal used in puddings" , "Starchy pudding cereal" , "Starchy grain used in desserts" .)

I've seen this clue in The Irish Times.

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