Playing area perfect for some musicians (5)
I believe the answer is:
pitch
I believe this is a double definition.
'playing area' is the first definition.
(eg a football pitch)
'perfect for some musicians' is the second definition.
(some musicians have perfect pitch)
(Other definitions for pitch that I've seen before include "Fling" , "perfect for some players" , "Sales talk - where games are played" , "Cricket-playing area" , "Degree of intensity" .)