Of small duration (5)
I believe the answer is:
short
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of small duration</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 short that I've seen before include "Concise" , "Wanting" , "Small in height" , "Cause to blow a fuse" , "Literary genre such as those by ..." .)