Peruvian metropolis (4)
I believe the answer is:
lima
'peruvian metropolis' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lima that I've seen before include "Mail to Peru'd capital" , "Kind of bean" , "Edible bean; capital city" , "Mail to capital of Peru" , "city (like 22)" .)