Greek capital (6)
I believe the answer is:
athens
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">greek capital</span>' is the definition.<br/ ><span class="explanation-format__explanation">(capital of Greece)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for athens that I've seen before include "Mediterranean capital" , "City of the Parthenon" , "6 capital" , "Capital of Greece" , "Greek capital" .)