Dens (5)

I believe the answer is:
lairs
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dens</span>' is the definition.<br/ ><span class="explanation-format__explanation">('lair' can be a synonym of 'den')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for lairs that I've seen before include "Habitations of wild animals" , "retreats" , "Places to hide" , "Resting places of wild animals" , "Animals' dens" .)