Crossword Genius

An accepted truth (5)

Ross

I believe the answer is:

axiom

'an accepted truth' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for axiom that I've seen before include "Fundamental proposition" , "Accepted general truth or principle" , "Plainly true proposition" , "Maxim, self-evident truth" , "that's self-evident" .)

I've seen this clue in the Sydney Morning Herald.
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