European capital on its own gulf (4)
I believe the answer is:
riga
'european capital on its own gulf' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for riga that I've seen before include "Baltic port" , "Fix a rig up here for the Latvians" , "A rig in Latvia" , "Latvian port" , "trading centre in Latvia" .)