Set of principles or standards (4)
I believe the answer is:
code
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">set of principles</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">standards</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I have seen 'Ethical standards' mean 'code' so perhaps 'standards' could also mean 'code')</span><br/ ><br/ ></span>
(Other definitions for code that I've seen before include "Cipher - set of principles" , "Secret system of letters. words etc" , "Ethical standards" , "Encryption, disguised language" , "Eg, Morse" .)