Smooth cotton thread (5)
I believe the answer is:
lisle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">smooth cotton thread</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for lisle that I've seen before include "Fine cotton thread used in stockings" , "Fine smooth cotton thread for stockings" , "Type of cotton yarn" , "Pedestrianised city" , "Strong cotton fabric" .)