17 across
Two
turncoats
left
skinhead’s
horde
once
(7)
Two turncoats left skinhead’s horde once (7)
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The definition is at the end of the clue.
How the clue works
The definition is horde once — the Tartars being that historical nomadic people. "Two turncoats" gives you TAR + TAR, since RAT (a turncoat) reversed twice does the job, and then "skinhead's" chips in with S, the first letter of "skin."