Weaver of myth (7)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">weaver of myth</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for arachne that I've seen before include "She was transformed to a spider in Greek myth" , "Greek girl who unwisely challenged Athena and ended up as a spider" .)