Remark to audience (5)
I believe the answer is:
aside
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">remark to audience</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 aside that I've seen before include "Line spoken to theatre audience" , "Out of other people's hearing" , "kept in reserve" , "Digression" , "Remark by an actor, directly to audience say" .)