Starchy root (7)

I think it could be either:

Which length description are you looking for?:

cassava

'starchy root' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for cassava that I've seen before include "Tropical food" , "Edible tropical root" , "Tropical American starchy plant" , "Manioc, source of tapioca" , "Plant yielding starch" .)

I've seen this clue in The Times.

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