Social conventions (5)

I believe the answer is:

'social conventions' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for mores that I've seen before include "of St Thomas's" , "Conventions, manners" , "Customs and conventions of a community" , "Customs and conventions of society" , "Local customs and conventions" .)

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

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