Reel for thread (6)
I believe the answer is:
bobbin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">reel for thread</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 bobbin that I've seen before include "Reel, spool" , "about which a yarn is spun" , "Cylinder for winding thread" , "Reel for yarn" , "Cotton reel" .)