Irish city's naval team that's driven in and out of port maybe (9)
I believe the answer is:
corkscrew
'that's driven in and out of port maybe' is the definition.
(a corkscrew may be used to open a bottle of port)
'irish city's naval team' is the wordplay.
'irish city's' becomes 'Cork's'.
'naval team' becomes 'crew' (crew on a boat).
'corks'+'crew'='CORKSCREW'
(Other definitions for corkscrew that I've seen before include "Twist" , "Device used to get at red" , "Wine bottle opener" , "Move in a spiral manner" , "This might help one who gets in the drink" .)