White-rooted biennial (5,4)

I believe the answer is:

sugar beet

'white-rooted biennial' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sugar beet that I've seen before include "foodstuff" , "It produces sweetener" .)

I've seen this clue in the King Feature Syndicate.

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