Subject of discussion (5)
I believe the answer is:
topic
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">subject of discussion</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 topic that I've seen before include "Subject matter of a conversation or discussion" , "That may be debatable" , "Something to discuss" , "Issue (for discussion)" , "Subject (of, eg, speech)" .)