Tropical plant whose starchy root is used to make tapioca (7)

I believe the answer is:

cassava

(Other definitions for cassava that I've seen before include "Tropical American starchy plant" , "Staple food, the source of tapioca" , "Manioc, source of tapioca" , "Starchy crop" , "source of starch" .)

I've seen this clue in The Times.

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