Knitting yarn (4)
I believe the answer is:
wool
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">knitting yarn</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wool that I've seen before include "Sheep's hair" , "Pull this over the eyes to deceive" , "Where the Lord Chancellor sits" , "Fleece of sheep" , "Yarn - cloth" .)