Arrange in categories (8)
I believe the answer is:
classify
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">arrange in categories</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 classify that I've seen before include "Arrange in divisions" , "Arrange by category" , "Grade" , "Categorise or pigeonhole" , "Order" .)