Long-lasting (7)
I believe the answer is:
durable
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">long</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">lasting</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for durable that I've seen before include "Rugged; long-lasting" , "Firm" , "Likely to last" , "Hardy" , "Good" .)