Versatile, flexible (9)
I believe the answer is:
adaptable
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">versatile</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</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 adaptable that I've seen before include "Open to modification" , "Good at fitting in to new situations" , "Flexible, pliant" , "Happy to fit in" , "Able to be modified" .)