Some passed over, turning up in port (6)
I believe the answer is:
odessa
'port' is the definition.
(Odessa is a Ukrainian port)
'some passed over turning up' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'turning up' says the letters should be written backwards.
'assedo' can be found hidden inside 'passed over'.
'assedo' reversed gives 'ODESSA'.
'in' acts as a link.
(Other definitions for odessa that I've seen before include "Battleship Potemkin mutiny port" , "Ukrainian Black Sea port" , "Do seas come into Ukrainian city?" , "Black Sea location" , "Ukrainian location" .)