Crossword Genius

Couple watch a traitor (3-5)

Ross

I believe the answer is:

two-timer

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

I've seen this clue in The Mirror.
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