Descend by rope (6)
I believe the answer is:
abseil
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">descend by rope</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 abseil that I've seen before include "Is able (anag.)" , "Come down a rock face using ropes" , "come down quickly" , "Descend vertically by rope" , "Use ropes to climb down a cliff face" .)