White-flowered West Indian plant whose rhizomes yield a starch used as a thickener for food (9)

I believe the answer is:

arrowroot

(Other definitions for arrowroot that I've seen before include "Medicinal plant" , "Nutritious starch from a West Indian plant" , "that thickens" , "Starch used for thickening sauces etc" , "Starchy plant" .)

I've seen this clue in The Mirror.

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