One man's motto (5)

I believe the answer is:

maxim

I believe this clue is a double definition.

'one man's' is the first definition.

'motto' is the second definition.
(thesaurus)

(Other definitions for maxim that I've seen before include "Short pithy statement" , "- Gorky, Russian writer" , "Apophthegm" , "Saying - inventor of machine gun" , "Brief expression of a general principle" .)

I've seen this clue in the Evening Standard.

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