Customs (5)

I believe the answer is:

'customs' is the definition.
(as in social mores)

This is the entire clue.

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

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

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