Metal thread
I believe the answer is:
wire
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">metal thread</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 wire that I've seen before include "Flex" , "Hand signal; breaker" , "Thin strip of metal, may be barbed" , "Flexible strands of metal" , "Cable" .)