Foreign port used by brigands? (4)

I believe the answer is:

riga

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'foreign port' is the definition.
'riga' can be an answer for 'port' (I have seen 'Latvian port ' mean 'riga' so perhaps 'port' could also mean 'riga'). I'm not certain of the 'foreign' bit.

'used by brigands?' is the wordplay.
'used by' says the answer is hidden in the clue.
'RIGA' is hidden within 'brigands'.

Can you help me to learn more?

(Other definitions for riga that I've seen before include "Latvian capital" , "Fix a rig up here for the Latvians" , "European capital" , "Baltic capital city" , "Capital city of Latvia" .)

I've seen this clue in the Evening Standard.

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