Of a metropolis (5)
I believe the answer is:
civic
'of a metropolis' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for civic that I've seen before include "Relating to citizenship or public affairs" , "Relating or belonging to a city" , "Relating to citizens" , "Relating to a citizen" , "This centre of town" .)