Morals (6)
I believe the answer is:
ethics
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">morals</span>' is the definition.<br/ ><span class="explanation-format__explanation">(ethics are moral principles)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ethics that I've seen before include "System of morals" , "Study of moral values and rules" , "Some philosophy" , "Codes of practice for businessmen" , "Science of moral principles" .)