Talk volubly, but don't exactly shout (5)

I believe the answer is:

spout

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'talk' is the definition.
(spout can informally mean to talk about something)

I don't understand the rest of the clue.

(Other definitions for spout that I've seen before include "Projecting tube through which liquid is poured" , "rant" , "Gush" , "Declaim; throw out in a spout" , "Mouth of a kettle" .)

I've seen this clue in the Evening Standard.

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