Benjamin, alliterative author of 'Simple Symphony (7)
I believe the answer is:
britten
'benjamin' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for britten that I've seen before include "Composer of Peter Grimes" , "Billy Budd composer" , "See 8" , "British composer associated with Aldeburgh" , "Benjamin -, twentieth century English composer (" .)