Legendary founder of Rome (7)
I believe the answer is:
romulus
'legendary founder of rome' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for romulus that I've seen before include "Founder of Rome from our slum" , "One of the legendary founders of Rome" , "City developer" , "Fratricide" , "Brother of 25 across" .)