Greek city (6)
I believe the answer is:
sparta
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">greek 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 sparta that I've seen before include "Ancient Greek city-state" , "it was a hard place" , "austere place" , "Ancient Greek city where great self-denial was practised" , "Ancient Greek city synonymous with austerity" .)