Large public room (6)
I believe the answer is:
saloon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large public 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 saloon that I've seen before include "Bar room" , "US bar - type of car" , "Car; public room" , "An American pub, as in the wild west" , "Boozer or shape of car" .)