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