Organising (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">organising</span>' is the definition.<br/ ><br/ >This is the entire clue.<br/ ></span>
(Another definition for arranging that I've seen is " Putting into order or setting up".)
(Other definitions for sorting that I've seen before include "Classifying" , "Grouping by class" , "Arranging in groups" .)