Early online forum (6)
I believe the answer is:
usenet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">early online forum</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for usenet that I've seen before include "Newsgroups worldwide" , "Internet facility" , "news system" .)