Athenian landmark (9)
I believe the answer is:
parthenon
'athenian landmark' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for parthenon that I've seen before include "ruined Greek temple" , "Temple of Athene on Acropolis in Athens" , "Tourist attraction of Athens" , "Ancient temple" , "Temple on the Athenian Acropolis" .)