Soda’s drunk with eastern port (6)
I believe the answer is:
odessa
'port' is the definition.
(Odessa is a Ukrainian port)
'soda's drunk with eastern' is the wordplay.
'drunk with' indicates anagramming the letters.
'eastern' becomes 'e'.
'sodas' with its letters mixed up with 'e' makes 'ODESSA'.
(Other definitions for odessa that I've seen before include "Battleship Potemkin mutiny port" , "Ukrainian Black Sea port" , "Do seas come into Ukrainian city?" , "Seaport" , "Port city of Ukraine" .)