Of small length (5)
I believe the answer is:
short
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of small length</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 short that I've seen before include "Wanting" , "Not long enough" , "Of small length" , "Literary genre such as those by ..." , "Terse; in insufficient supply" .)