Compositions at expected time on Sunday (5)
I believe the answer is:
duets
'compositions' is the definition.
(duet is a kind of composition)
'expected time on sunday' is the wordplay.
'expected' becomes 'due' (I've seen this before).
'time' becomes 't'.
'on' is a charade indicator (letters next to each other).
'sunday' becomes 's'.
'due'+'t'+'s'='DUETS'
'at' is the link.
(Other definitions for duets that I've seen before include "Works for two" , "Songs sung by two" .)