Land of Leonidas (6)
I believe the answer is:
sparta
'land of leonidas' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for sparta that I've seen before include "Ancient Greek city state" , "Ancient Greek city noted for tough citizens" , "found in Ancient Greek location" , "Where to find ancient Greek" , "Ancient Greek city whose citizens were famed for toughness" .)