A free warrior-peasant who served as a member of the tsar's cavalry (7)

I believe the answer is:

cossack

(Other definitions for cossack that I've seen before include "Belligerent Russian" , "Equestrian" , "Warrior peasant of SE Russia" , "Russian or Ukrainian cavalryman" , "One of a people from SW Russia, Ukraine" .)

I've seen this clue in The Independent.

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