Presenter and what her voice may come from (7)

I believe the answer is:

speaker

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'presenter' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I can't explain the rest of the clue.

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(Other definitions for speaker that I've seen before include "Contributor to debate" , "Michael Martin MP" , "Parliamentary authority" , "One presiding over House of Commons" , "Parliamentary official" .)

I've seen this clue in The Guardian.

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