Try hard; enterprise (9)
I believe the answer is:
endeavour
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">try hard</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">enterprise</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for endeavour that I've seen before include "hard work" , "The first handle inspector has" , "Morse" , "Try hard; enterprise" , "First space shuttle to visit the International Space Station" .)