One who makes or interprets a score (6)
I believe the answer is:
player
'one who makes or interprets a score' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for player that I've seen before include "Batsman perhaps" , "Professional musician - team sportsperson" , "Sportsman - instrumentalist" , "Sports participant" , "powerful participant" .)