Sort of chance for a boy soprano? (6)

I believe the answer is:

treble

I'm a little stuck... Click here to teach me more about this clue!

'boy soprano?' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for treble that I've seen before include "boy in church choir" , "Triple - soprano voice" , "Threefold - singing voice" , "High boy's singing voice" , "What boys sing" .)

Want a hint initially instead of a full solution? Install my app