Closed meeting (6)
I believe the answer is:
caucus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">closed meeting</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 caucus that I've seen before include "Small group of like-minded politicians" , "Political grouping" , "Political assembly" , "Assembly, conclave" , "(US) party meeting" .)