Unaccompanied part song bringing great delight (4)
I believe the answer is:
glee
I believe this is a double definition.
'unaccompanied part song' is the first definition.
(I've seen this in another clue)
'great delight' is the second definition.
(I've seen this in another clue)
'bringing' acts as a link.
(Other definitions for glee that I've seen before include "Great pleasure" , "Unholy mirth or triumphant joy" , "Unrestrained joy" , "Great delight; part song" , "Part-song for male voices - delight" .)