Lasting a very short time (9)

I believe the answer is:
ephemeral
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lasting a very short time</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 ephemeral that I've seen before include "not going to last long" , "Fleeting, lasting only a short time" , "Transient, fleeting" , "Transitory" , "Fugitive" .)