Performance involving couple expected on time (4)
I believe the answer is:
duet
'performance involving couple' is the definition.
I can't tell whether this defines the answer.
'expected on time' is the wordplay.
'expected' becomes 'due' (similar in meaning).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'time' becomes 't' (abbreviation).
'due'+'t'='DUET'
Can you help me to learn more?
(Other definitions for duet that I've seen before include "Two singers performing together" , "Performance by two" , "Work for two players" , "Two-piece" , "Music for two" .)