Crossword Genius

Cab heading off to the centre of Rome? That's taken for granted (5)

Ross

I believe the answer is:

axiom

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

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for axiom that I've seen before include "Self-evident statement" , "Dictum" , "Proposition assumed to be self-evident" , "Fundamental proposition" , "rule" .)

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