One's first parts in place of singer (5)

I believe the answer is:

voice

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

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

(Other definitions for voice that I've seen before include "Sound produced by humans" , "Power of speech" , "Sound produced in the larynx" , "Opinion; ability to speak" , "Opinion; express in words" .)

I've seen this clue in The Telegraph.

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