Rugged, durable (5)
I believe the answer is:
hardy
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">rugged</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >'<span class="explanation-format__original">durable</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for hardy that I've seen before include "Resistant to frost etc" , "Stalwart" , "Rugged; author" , "Author - robust" , "relatively able to endure exposure" .)