Scales
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">scales</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 climbs that I've seen before include "Moves upward gradually" , "Goes up" , "Ascends with difficulty" , "Moves upwords" , "Ascends a hill or ladder" .)