Host starts to make conversation audibly (5)

I believe the answer is:

emcee

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'host' is the definition.
(emceeing is a kind of hosting)

I don't understand the remainder of the clue.

(Other definitions for emcee that I've seen before include "One presents" , "Presenter" , "Master of ceremonies (mainly US)" , "MC" , "Show host" .)

I've seen this clue in The Telegraph.

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