Relating to ancient Troy (6)
I believe the answer is:
trojan
'relating to ancient troy' is the definition.
(I know this)
This is all the clue.
(Other definitions for trojan that I've seen before include "Native of Troy" , "Computer threat" , "Paris, for example - harmful computer program" , "Hard grafter (from an ancient city?)" , "To work like one is to work hard" .)