Crossword Genius

Some too slow in city (4)

Ross

I believe the answer is:

oslo

'city' is the definition.
(capital of Norway)

'some too slow in' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'OSLO' is hidden within 'too slow in'.

(Other definitions for oslo that I've seen before include "Nordic city" , "Location" , "Capital in throes of go-slow" , "European capital, known until 1924 as Christiania" , "European capital in go-slow" .)

I've seen this clue in The Sun.
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