Zoo section (6)
I believe the answer is:
aviary
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">zoo section</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 aviary that I've seen before include "House for birds" , "Cut gem; small film part" , "Large bird cage" , "Cage(s) to keep birds" , "Where flights are limited" .)