Precept (5)
I believe the answer is:
tenet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">precept</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for tenet that I've seen before include "Matter of belief" , "That's the law" , "Dogma or principle" , "Doctrine; principle held" , "Palindromic principle or belief" .)