Bird's sleeping place (5)
I believe the answer is:
roost
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bird's sleeping place</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 roost that I've seen before include "It's sometimes ruled" , "Place where birds rest" , "Bat's resting place" , "The cock rules it" , "Rest on a perch" .)