Passing things (8)
I believe the answer is:
ephemera
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">passing things</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 ephemera that I've seen before include "Highly transient things" , "They won't last long" , "Short-lived things of passing usefulness" , "Flyer" , "They're soon over" .)