Nominally a large figure (5)

I believe the answer is:

maxim

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

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(Other definitions for maxim that I've seen before include "Axiom" , "Principle-first machine gun" , "Gorky saw" , "Widely accepted saying" , "- Gorky, Russian writer" .)

I've seen this clue in the Evening Standard.

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