Medium for discussion (5)
I believe the answer is:
forum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">medium for discussion</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 forum that I've seen before include "Place for open discussion" , "Roman meeting place" , "Meeting for debate" , "discussion group" , "Ground for discussion" .)