As a singer, maybe a belter! (6)

I believe the answer is:

treble

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

'as a singer' is the definition.
I can't judge whether this defines the answer.

'maybe a belter' is the wordplay.
'maybe' is an anagram indicator.
'belter' is an anagram of 'TREBLE'.

Can you help me to learn more?

(Other definitions for treble that I've seen before include "Boy chorister" , "Inner ring score (darts)" , "Member of choir" , "bet?" , "Multiple score in darts" .)

I've seen this clue in the Evening Standard.

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