Precept, principle (5)
I believe the answer is:
tenet
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">precept</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">principle</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(a tenet is a principle or value)</span><br/ ><br/ ></span>
(Other definitions for tenet that I've seen before include "A religious doctrine proclaimed as true without proof" , "That's the law" , "A belief or credo - it's a palindrome" , "Opinion held to be true" , "Canon" .)