The chief port of Spain (9)
I believe the answer is:
barcelona
'the chief port of spain' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for barcelona that I've seen before include "Chief port of Spain" , "Span. City" , "Largest Spanish port" , "Spain's second largest city" , "City and province of Catalonia in NE Spain" .)