Succeed, flourish (7)
I believe the answer is:
prosper
This clue is a double definition.
'succeed' is the first definition.
(I've seen this before)
'flourish' is the second definition.
(I know that flourish can be written as prosper)
(Other definitions for prosper that I've seen before include "like Merimee, nominally" , "Thrive, boom" , "Succeed, flourish" , "Make good" , "Go well" .)