As a singer, a wild belter (6)

I believe the answer is:

treble

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

'wild belter' is the wordplay.
'wild' indicates an anagram.
'belter' is an anagram of 'TREBLE'.

Can you help me to learn more?

(Other definitions for treble that I've seen before include "Make or become three times as much" , "a very large one" , "Consisting of three parts; voice" , "Chorister; multiply by three" , "Three times as many" .)

I've seen this clue in the Evening Standard.

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