Female choral voice (4)
I believe the answer is:
alto
'female choral voice' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alto that I've seen before include "Unisex vocal range" , "Highest male voice: lowest female voice" , "High male singing voice" , "The highest adult male singing voice" , "The highest adult male singing-voice" .)