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' indicates a hidden word (some parts of the word are used).
'turning up' is a reversal indicator.
'assedo' is hidden within 'passed over'.
'assedo' back-to-front is '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" .)