Run in a stocking (6)
I believe the answer is:
ladder
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">run in a stocking</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 ladder that I've seen before include "Run in stockings" , "Vertical run in tights" , "Domestic device for climbing" , "A fire-fighter may use one" , "Climbing steps or rungs" .)