Site of King Harald V's palace (4)
I believe the answer is:
oslo
'site of king harald v's palace' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oslo that I've seen before include "European capital, known until 1924 as Christiania" , "Scandinavian capital" , "Former Christiania" , "foreign port" , "Northern city" .)