Crossword Genius

Due to get picked up along with au pair (3)

Ross

I believe the answer is:

duo

'pair' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for duo that I've seen before include "Two-person act" , "Musical work for two" , "Pair of people/things" , "rejected Arab's lute" , "entertainers such as Eric and Ernie" .)

I've seen this clue in The Times.
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