Crossword Genius

Postulate (5)

Ross

I think it could be either:

posit

axiom

'postulate' 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 "A saying that's widely accepted as true" , "that's self-evident" , "Principle; assumption" , "Generally accepted truism" , "Accepted general truth or principle" .)

I've seen this clue in The Mirror, the Evening Standard, the Sydney Morning Herald and The Telegraph.
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