Organ division (4)
I believe the answer is:
lobe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">organ division</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lobe that I've seen before include "could be site of a 24 [STUD]" , "Piece of ear" , "Rounded part (of organ)" , "Lower part of the ear" , "Base of ear" .)