Port boozer knocked back after ten, getting drunk (8)
I believe the answer is:
entrepot
'port' is the definition.
(entrepot is a kind of port)
'boozer knocked back after ten getting drunk' is the wordplay.
'boozer' becomes 'toper' (I've seen this before**).
'knocked back' says the letters should be written backwards.
'after' says to put letters next to each other.
'getting drunk' indicates anagramming the letters.
'toper' back-to-front is 'repot'.
'ten' with letters rearranged gives 'ent'.
'repot' put after 'ent' is 'ENTREPOT'.
(Other definitions for entrepot that I've seen before include "Storehouse" , "Trading port" , "Import/export warehouse, port" , "Bonded warehouse; port" .)