Russian paramilitary group active in Syria and Ukraine (6)

I believe the answer is:

wagner

(Other definitions for wagner that I've seen before include "Tannhauser composer" , "Richard . . . . . . composer of 'The Flying Dutchman' and 'Lohengrin'" , "German cycle-maker" , "German opera composer" , "Richard . . . . . . composed The Flying Dutchman" .)

I've seen this clue in The Guardian.

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