Ancient siege site
I believe the answer is:
troy
'ancient siege site' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for troy that I've seen before include "City besieged by the Greeks - system of weights for gems" , "Legendary ancient city of northwest Anatolia" , "City of Paris" , "City destroyed" , "Priam's city" .)