Co-founder of Rome (5)
I believe the answer is:
remus
'co-founder of rome' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for remus that I've seen before include "Brother of 24 across" , "partner in City foundation" , "Co-founder of Rome" , "Suckled by a she-wolf, I was" , "Avuncular story-teller" .)