Queen of the Adriatic (6)
I believe the answer is:
venice
'queen of the adriatic' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for venice that I've seen before include "Italy's water city" , "Watery city" , "Archdeacon subject to delay, it's implied, in" , "Italian city once known as Queen of the Adriatic" , "Messages" .)