Party overseas? Possibly in Ukrainian port! (6)

I believe the answer is:

odessa

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'ukrainian port' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for odessa that I've seen before include "Black Sea location" , "Ukrainian location" , "Port city of Ukraine" , "Seaport" , "Ukrainian naval base" .)

I've seen this clue in The Irish Times.

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