Customs and conventions (5)

I believe the answer is:

'customs and conventions' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for mores that I've seen before include "Conventional values" , "Customs and conventions of society" , "Society's customs" , "(Society's) conventions" , "codes" .)

I've seen this clue in The Independent and The Guardian.

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