Principle relating to a culture that’s unnamed? (5)

I believe the answer is:

ethic

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'principle' is the definition.
(I know that ethic is a type of principle)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ethic that I've seen before include "Ideology" , "System of principles" , "set of morals" , "Principles accepted by a social group" , "Moral code" .)

I've seen this clue in The Times.

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