Hideout (4)
I believe the answer is:
lair
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hideout</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 lair that I've seen before include "Rail around hiding-place" , "Den of a wild animal" , "enclosure" , "Rail around animal's den" , "Burrow" .)