Online discussion site (5)
I believe the answer is:
forum
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">online discussion site</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for forum that I've seen before include "Ancient Roman marketplace or place for public discussions" , "Online message board" , "Meeting of people for discussion" , "Place of assembly for the people in ancient Greece" , "Place for open discussion" .)