Restrain with rope (6)
I believe the answer is:
tether
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">restrain with rope</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 tether that I've seen before include "Restrain within limits" , "Rope; the exasperated at the end of it" , "restricts movement" , "Restraint for animal" , "Rope restricting animal's movement" .)