Crossword Genius

Almost expecting old couple (3)

Ross

I believe the answer is:

duo

I'm a little stuck... Click here to teach me more about this clue!

'couple' is the definition.
(I know that couple can be written as duo)

I don't 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 "Item" , "Two of a kind" , "Pair of musicians" , "Double act" , "Performing pair" .)

I've seen this clue in The Mirror.
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