Rule, tenet (7)
I believe the answer is:
precept
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">rule</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that precept is a type of rule)</span><br/ ><br/ >'<span class="explanation-format__original">tenet</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for precept that I've seen before include "Rubric" , "Rule of conduct or command" , "General rule for behaviour" , "Rule or principle" , "Rule of action" .)