Large meeting room (4)
I believe the answer is:
hall
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large meeting room</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 hall that I've seen before include "Building used for public assembly" , "Entrance area" , "Foyer" , "Large public building" , "Large country house" .)