Port passed, offering bottles to the left (6)
I believe the answer is:
odessa
'port' is the definition.
(I've seen this before)
'passed offering bottles to the left' is the wordplay.
'bottles' indicates the answer is hidden within the clue (bottling is a kind of containing).
'to the left' is a reversal indicator (reading from right to left).
'assedo' is hidden in the letters of 'passed offering'.
'assedo' written backwards gives 'ODESSA'.
(Other definitions for odessa that I've seen before include "Battleship Potemkin mutiny port" , "Port city of Ukraine" , "Ukrainian naval base" , "Ukrainian Black Sea port" , "Black Sea location" .)