Revolutionary passed out drinking port (6)
I believe the answer is:
odessa
'port' is the definition.
(I've seen this before)
'revolutionary passed out drinking' is the wordplay.
'revolutionary' is a reversal indicator.
'drinking' indicates the answer is hidden within the clue (the clue has drunk in the answer).
'assedo' is hidden in the letters of 'passed out'.
'assedo' reversed gives 'ODESSA'.
(Other definitions for odessa that I've seen before include "Ukrainian naval base" , "Ukrainian Black Sea port" , "Black Sea location" , "Battleship Potemkin mutiny port" , "Seaport" .)