Ukrainian seaport (6)
I believe the answer is:
odessa
'ukrainian seaport' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for odessa that I've seen before include "Port city on the Black Sea" , "Ukrainian location" , "Black Sea location" , "Do seas come into Ukrainian city?" , "Battleship Potemkin mutiny port" .)