Sailor also called for port (5)
I believe the answer is:
osaka
'for port' is the definition.
(I've seen this before)
'sailor also called' is the wordplay.
'sailor' becomes 'os' (ordinary seaman).
'also called' becomes 'aka' (also known as).
'os'+'aka'='OSAKA'
(Other definitions for osaka that I've seen before include "Major port and commercial and industrial centre on Honshu" , "Kinki's capital" , "Port city of southern Honshu" , "Third largest city in Japan" , "Japanese city near Kobe" .)