Glory in making return to sack Assad’s capital city (7)

I believe the answer is:
nineveh
'city' is the definition.
(Nineveh is an example)
'glory in making return to sack assad's capital' is the wordplay.
I cannot really understand how this works, but
'in' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for nineveh that I've seen before include "Assyrian capital; Jonah preached against it" , "old city" , "Ancient Assyrian city" , "Ancient capital of Assyria" , "Ancient Assyrian capital" .)
