High range (6)
I believe the answer is:
treble
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">high range</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(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" .)