The ancient capital of Assyria, on the River Tigris (7)

I believe the answer is:

nineveh

(Other definitions for nineveh that I've seen before include "Assyrian capital; Jonah preached against it" , "Ancient city on the Tigris" , "old city" , "Biblical city" , "Ancient Assyrian capital" .)

I've seen this clue in The Independent.

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