Almost expecting old couple (3)
I believe the answer is:
duo
'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" .)