Large exhibition (4)
I believe the answer is:
expo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">large exhibition</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 expo that I've seen before include "Trade fair" , "Public spectacle" , "Public showing" , "Large international fair" , "Major international fair" .)