Crossword Genius

Yam or potato (5)

Ross

I believe the answer is:

tuber

(Other definitions for tuber that I've seen before include "Fleshy root, vegetable say" , "Fleshy underground stem (eg of the potato)" , "Thickened fleshy root" , "Potato maybe" , "Eg, dahlia root" .)

I've seen this clue in The Wall Street Journal.
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