Snow house (5)
I believe the answer is:
igloo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">snow house</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for igloo that I've seen before include "White House" , "packed house" , "Snow dwelling" , "Inuit building" , "Living quarters" .)