Mediterranean metropolis (9)
I believe the answer is:
barcelona
'mediterranean metropolis' is the definition.
(I know that Barcelona is a metropolis)
This is all the clue.
(Other definitions for barcelona that I've seen before include "Chief port of Spain" , "coastal city" , "City and province of Catalonia in NE Spain" , "Largest Spanish port" , "Major city in NE Spain" .)