Numbers of Romans about the city (5)
I believe the answer is:
civic
This clue is a double definition.
'numbers of romans' is the first definition.
(I've seen this before)
'the city' is the second definition.
(I've seen this before)
'about' is the link.
(Other definitions for civic that I've seen before include "This centre of town" , "Numbers of Romans" , "Relating to a town/city" , "view of the city" , "Relating to citizenship or public affairs" .)