Of little weight (5)
I believe the answer is:
light
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">of little weight</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 light that I've seen before include "Unimportant" , "Pale" , "Window; insubstantial" , "Not heavy; understanding" , "Illumination weighs very little" .)