Honshu port (5)
I believe the answer is:
osaka
'honshu port' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for osaka that I've seen before include "Japanese city near Kobe" , "S. Japan port, bay" , "Japanese port, on Honshu" , "Japan's third-largest city" , "Asian" .)