Seemly behaviour (7)
I believe the answer is:
decorum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">seemly behaviour</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" , "Decency" , "Seemliness" , "Protocol" , "Good form" .)