Persist longer than (7)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
outlast
'persist longer than' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for outlast that I've seen before include "Survive beyond" , "carry on after all others" , "Live longer than" , "Go on longer than" , "Persist longer than" .)