Some fool socialist up in Norwegian city (4)
I believe the answer is:
oslo
'norwegian city' is the definition.
(I've seen this before)
'some fool socialist up' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'olso' is hidden within 'fool socialist'.
'olso' written backwards gives 'OSLO'.
'in' is the link.
(Other definitions for oslo that I've seen before include "Location" , "It's capital in Anglos London" , "Norwegian city, formerly Kristiania" , "Northern capital of Czechoslovakia?" , "Nordic city" .)