Gossamer — transparent (8)
I believe the answer is:
cobwebby
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">gossamer</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that gossamer can be written as cobwebby)</span><br/ ><br/ >'<span class="explanation-format__original">transparent</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that transparent can be written as cobwebby)</span><br/ ><br/ ></span>
(Other definitions for cobwebby that I've seen before include "Unclean (of corners in attics, perhaps?)" , "very fine?" , "needing new broom" , "Like an unswept corner" .)