Passing craze
I believe the answer is:
fad
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">passing craze</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for fad that I've seen before include "Passionate interest" , "Personal whim" , "A passing fashion or craze" , "Caprice" , "Passing vogue or fashion" .)