European capital – Trojan prince (5)
I believe the answer is:
paris
I believe this clue is a double definition.
'european capital' is the first definition.
(capital of France)
'trojan prince' is the second definition.
(I've seen this in another clue)
(Other definitions for paris that I've seen before include "An American in - -" , "Helen's abductor" , "Legendary prince" , "City on the Seine" , "foreign city" .)