Axiom or maxim (5)

I believe the answer is:

adage

This clue is a double definition.

'axiom' is the first definition.
(I've seen this before)

'maxim' is the second definition.
(I've seen this before)

(Other definitions for adage that I've seen before include "Short statement expressing a general truth" , "Old saying, maxim" , "Well-remembered proverb or saying" , "Dictum" , "Saying, saw" .)

I've seen this clue in The Telegraph.

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