How Dolores starts to show excessive enthusiasm (5)

I believe the answer is:

drool

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'show excessive enthusiasm' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I can't see?

I don't understand the rest of the clue.

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(Other definitions for drool that I've seen before include "Dogs may" , "Show excitement" , "dribble" , "Spill saliva" , "Slaver - drivel" .)

I've seen this clue in the Evening Standard.

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