Crossword Genius

Spud

Ross

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5 6

(Other definitions for tuber that I've seen before include "Eg, dahlia root" , "A brute of a spud" , "or still vegetating?" , "Brute or a potato plant" , "One goes underground" .)

I've seen this clue in The Star Tribune, The Mirror, the Penny Press, the Universal, the King Feature Syndicate, the LA Times and The Wall Street Journal.
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