As is proper (5)
I believe the answer is:
aptly
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">as is proper</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for aptly that I've seen before include "as is fitting" , "Appropriately" , "In suitable form" , "Fittingly" , "In suitable fashion" .)