Crossword Genius

Double-crosser (3-5)

Ross

I believe the answer is:

two-timer

(Other definitions for two-timer that I've seen before include "Unfaithful lover in arithmetic mode" , "Unfaithful partner" , "Unfaithful person" , "One sleeps around" , "Deceiver" .)

I've seen this clue in The Mirror.
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