It's built by a spider (6)
I believe the answer is:
cobweb
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">it's built by a spider</span>' is the definition.<br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cobweb that I've seen before include "Dusty spider's weaving" , "Literary fairy" , "Spider trap" , "Filaments made by a spider" , "Spider's gossamer" .)