Crossword Genius

Stab (someone) in the back (6-5)

Ross

I believe the answer is:

double-cross

(Other definitions for double-cross that I've seen before include "Cheat - betray" , "Deceive supposed ally" , "Betray - XX?" , "Deceive (an ally, maybe)" , "Deceive, betray" .)

I've seen this clue in The Guardian.
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