Thrive, be successful (7)
I believe the answer is:
prosper
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">thrive</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that thrive can be written as prosper)</span><br/ ><br/ >'<span class="explanation-format__original">be successful</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for prosper that I've seen before include "like Merimee, nominally" , "Succeed, flourish" , "Go well" , "Do well, be successful in life" , "Make good" .)