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In which two performers are expected to tango? (4)

Ross

I believe the answer is:

duet

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'in which two performers' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'expected to tango?' is the wordplay.
'expected' becomes 'due' (similar in meaning).
'to tango?' becomes 'T' (phonetic alphabet: alpha, bravo, charlie etc.).
'due'+'t'='DUET'

'are' acts as a link.

Can you help me to learn more?

(Other definitions for duet that I've seen before include "Musical piece for two performers" , "Music for two" , "Performance by company, perhaps" , "Piece for brace" , "Performance by two" .)

I've seen this clue in the Evening Standard.
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