Crossword Genius

Horseradish ___ (5)

Ross

I believe the answer is:

sauce

(Other definitions for sauce that I've seen before include "sharp language" , "Impertinence (colloq.)" , "(Semi)liquid flavouring" , "Insolence" , "Impertinence; dressing" .)

I've seen this clue in The Washington Post.
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