Categorize (6)
I believe the answer is:
assort
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">categorize</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that assort is a more specific form of categorize)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for assort that I've seen before include "Distribute in classes" , "(Of genes) become distributed among cells" , "Categorise" , "Classify, arrange in groups" , "Class" .)