Capital of ancient Assyria (7)
I believe the answer is:
nineveh
'capital of ancient assyria' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for nineveh that I've seen before include "Ancient city on the Tigris" , "Ancient Assyrian city" , "Ancient Assyrian capital" , "Ancient capital of Assyria" , "old city" .)