Propriety, etiquette (7)
I believe the answer is:
decorum
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">propriety</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that decorum is a type of propriety)</span><br/ ><br/ >'<span class="explanation-format__original">etiquette</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for decorum that I've seen before include "Decency" , "good grace" , "Seemly behaviour" , "Propriety in manners and conduct" , "This is becoming" .)