Short-lived crazes (4)
I believe the answer is:
fads
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">short-lived crazes</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 fads that I've seen before include "Short-lived crazes" , "Fashions or vogues" .)