Supple, flexible (6)
I believe the answer is:
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">supple</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that supple can be written as limber)</span><br/ ><br/ >'<span class="explanation-format__original">flexible</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for limber that I've seen before include "Artillery equipment" , "Lithe" , "Able to move supply" , "Agile, supple" , "Supple; flexible" .)