One of those things (4)
I believe the answer is:
that
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">one of those things</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 that that I've seen before include "See 5" , "Yon" , "Take ..., English pop band" , "Not 8 Ac but the other" , "Just like --; -- is to say" .)