Restricting rope (6)
I believe the answer is:
tether
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">restricting 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 "lead" , "Restricting rope, chain" , "Range of one's endurance: tie up (horses)" , "Restrictive rope fixed to one spot" , "Restrain a horse with a rope" .)