Singer producing three times the volume? (6)

I believe the answer is:

treble

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'singer' is the definition.
(I know that treble is a type of soprano)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for treble that I've seen before include "Boy singer" , "High-pitched or soprano, instrument or boy's voice" , "Inner ring score (darts)" , "Triple - soprano voice" , "Hit in inner ring of dartboard" .)

I've seen this clue in The Irish News.

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