Within a building (7)
I believe the answer is:
indoors
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">within a building</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for indoors that I've seen before include "With a roof over one's head?" , "Within house" , "Within a building" , "Within the four walls" , "home" .)