Prosper, flourish (6)
I believe the answer is:
thrive
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">prosper</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that prosper can be written as thrive)</span><br/ ><br/ >'<span class="explanation-format__original">flourish</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that flourish can be written as thrive)</span><br/ ><br/ ></span>
(Other definitions for thrive that I've seen before include "Do well, flourish" , "Grow vigorously, flourish" , "Prosper, grow well" , "Grow strongly" , "Prosper, flourish" .)