What might be playing Hart score? (9)
I believe the answer is:
orchestra
'what might' is the definition.
I can't judge whether this definition defines the answer.
'playing hart score?' is the wordplay.
'playing' indicates anagramming the letters.
'hart'+'score'='hartscore'
'hartscore' is an anagram of 'ORCHESTRA'.
'be' acts as a link.
Can you help me to learn more?
(Other definitions for orchestra that I've seen before include "Other cars (anag.)" , "Instrumental group" , "Theatre area for musicians" , "LSO, for example" , "Large band of players" .)