Not tethered (5)
I believe the answer is:
loose
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not tethered</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 loose that I've seen before include "Not tied up or attached" , "Not tightly fixed" , "Unfettered" , "escaped!" , "Not restrained or attached" .)