Pair watches partners being unfaithful (3-6)

I believe the answer is:

two-timers

I believe this clue is a double definition.

'pair watches' is the first definition.
(a pair of watches is two timers)

'partners being unfaithful' is the second definition.
(two-timing is cheating)

(Another definition for two-timers that I've seen is " Traitors".)

I've seen this clue in The Guardian.

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