Ancient Greek or Egyptian city (6)
I believe the answer is:
thebes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ancient greek or egyptian city</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 thebes that I've seen before include "Greek city founded by Cadmus" , "Greek city of Oedipus" , "Ancient city of upper Egypt" , "One of the oldest Greek cities" , "Ancient city, a rival to Athens" .)