Seemliness (7)
I believe the answer is:
decorum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seemliness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for decorum that I've seen before include "Dignity of behaviour or proceedings" , "This is becoming" , "Seemly behaviour" , "Proper behaviour; etiquette" , "(Of outward appearances) what is proper" .)