Chorister (8)
I believe the answer is:
choirboy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">chorister</span>' is the definition.<br/ ><span class="explanation-format__explanation">(choirboy is a kind of chorister)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for choirboy that I've seen before include "Cathedral singer" , "Young church singer" , "A treble in church" .)