Some go slowly in the capital (4)
I believe the answer is:
oslo
'capital' is the definition.
(capital of Norway)
'some go slowly in' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'OSLO' can be found hidden inside 'go slowly in'.
'the' is the link.
(Other definitions for oslo that I've seen before include "European capital in go-slow" , "Scandinavian city" , "Northern capital of Czechoslovakia?" , "City in Norway" , "Solo in Norway?" .)