Ancient Greek city (6)
'ancient greek city' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for sparta that I've seen before include "Ancient Greek city known for warlike spirit" , "Formerly "City" , "Ancient Greek city noted for its austerity" , "place of austerity" , "Ancient Greek city where great self-denial was practised" .)
(Other definitions for delphi that I've seen before include "'Ancient Greek city, site of the oracle (6)'" , "Place of the famous oracle" , "Dead ringer" , "Religious sanctuary of ancient Greece (with an Oracle)" , "Temple site on Mt Parnassus" .)
'ancient greek city' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for corinth that I've seen before include "Mediterranean port" , "Greek Gulf, isthmus city" , "Region of ancient Greece" , "City of Greece" , "Ancient Greek city" .)