Chubby seal. (4,4)

I believe the answer is:

full stop

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'chubby seal' 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?

This is the entire clue.

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(Other definitions for full stop that I've seen before include "period in America" , "Punctuation mark - period" , "'Punctuation mark (4,4)'" , "Point" , "finalised" .)

I've seen this clue in The Guardian.

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