Thickening agent obtained from the cassava plant (7)

I believe the answer is:

tapioca

(Other definitions for tapioca that I've seen before include "Pudding from the cassava root" , "Starch from cassava used in making puddings" , "I act OAP (anag) - edible substance made from cassava" , "Starchy dish" , "Starchy food" .)

I've seen this clue in The Times.

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