Double-dealer (3-5)

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3-5

two-timer

'double-dealer' is the definition.
(thesaurus)

This is the entire clue.

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

I've seen this clue in The Guardian.

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