Crossword Genius

Established rule (5)

Ross

I believe the answer is:

axiom

'established rule' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for axiom that I've seen before include "Plainly true proposition" , "Accepted statement taken as self-evidently true" , "Accepted general truth or principle" , "It's taken for granted" , "Fundamental proposition" .)

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