Crossword Genius

An act of duplicity? (3)

Ross

I think it could be either:

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3

4

duo

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'act of duplicity?' is the definition.
'duo' can be an answer for 'act' (I have seen 'Double act ' mean 'duo' so perhaps 'act' could also mean 'duo'). I'm unsure of the 'of duplicity?' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for duo that I've seen before include "Musical pair" , "Couple, pair" , "Pair of people/things" , "Item" , "Performing couple" .)

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