Possible Clues:

• Port seen from sea — it's only from the starboard side?
• Old port? Host I admire can afford it
• Drunken sot knocked back first-class vintage port
• Roman port
• Town on the Tiber
• Leaders of our state touring in an ancient city
• Old Roman place, very large, on backward little island
• Ancient harbour's openings
• Tosti allowed entry to the old city
• Ancient Roman port; terminus of the Tiber