Crossword Genius

Hot rootstock (6)

Ross

I believe the answer is:

ginger

(Other definitions for ginger that I've seen before include "Red (of hair)" , "Hot-tasting root or general liveliness" , "Spice - former Spice Girl" , "Spicy plant-stem" , "Hot fragrant spice" .)

I've seen this clue in The Times.
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