Crossword Genius

A stout whip used formerly in Russia as an instrument of punishment (5)

Ross

I believe the answer is:

knout

(Other definitions for knout that I've seen before include "Whip once used in Russia" , "It was used to inflict punishment" , "Flog" , "Russian whip is finally not at home" .)

I've seen this clue in The Independent.
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