Crossword Genius

An act of duplicity? (4)

Ross

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3

4

duet

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'an act' is the definition.
(duet is a kind of act)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for duet that I've seen before include "Work for two performers" , "Paired performance" , "Two singers performing together" , "Composition for two performers" , "Music for two" .)

I've seen this clue in The Telegraph, The Globe and Mail and The Guardian.
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