"Iliad" city (4)
I believe the answer is:
troy
'iliad city' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for troy that I've seen before include "part of Asia Minor" , "City besieged by the Greeks - system of gem weight measurement" , "Helen of --, beauty" , "System of weights; ancient city in Turkey" , "Iliad siege city" .)