Assyrian capital (7)
I believe the answer is:
nineveh
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">assyrian capital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nineveh that I've seen before include "Ancient Assyrian capital" , "Assyrian capital; Jonah preached against it" , "Ancient capital of Assyria" , "Biblical city" , "old city" .)