Crossword Genius

Rules of behaviour (6)

Ross

I believe the answer is:

ethics

(Other definitions for ethics that I've seen before include "Principles to be observed by business and professions" , "Moral principles in middle" , "Wild and impassioned period of shouting" , "Codes of standards in business" , "Study of moral values and rules" .)

I've seen this clue in The Guardian.
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