English composer a joy (5)
I believe the answer is:
bliss
I believe this clue is a double definition.
'english composer' is the first definition.
(Arthur Bliss, 1891-1975)
'a joy' is the second definition.
(I've seen this before)
(Other definitions for bliss that I've seen before include "Great joy" , "Extreme happiness" , "Great happiness" , "Beatitude" , "Rapture; Sir Arthur ---, composer" .)