Greece's capital (6)
I believe the answer is:
athens
'greece's capital' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for athens that I've seen before include "Hasten to Greek city" , "Hasten to the Hellenic city" , "Greek capital" , "City of the Parthenon" , "Capital of Greece" .)