He makes a suitable score (8)
I believe the answer is:
arranger
'he makes a suitable score' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he makes a' is the wordplay.
I cannot quite see how this works, but
'he' could be 'ange' and 'ange' is located in the answer.
'a' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for arranger that I've seen before include "One planning" , "Organiser" , "One adapting music for different forces" , "Musician" , "Orchestrator" .)