High range (6)
I believe the answer is:
treble
'high range' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for treble that I've seen before include "High darts score" , "boy in church choir" , "Hit in inner ring of dartboard" , "Soprano - multiply by three" , "Threefold - singing voice" .)