Spin round one city (5)
I believe the answer is:
turin
'city' is the definition.
(Turin is an example)
'spin round one' is the wordplay.
'spin' becomes 'turn' (I've seen this in other clues).
'round' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'turn' going around 'i' is 'TURIN'.
(Other definitions for turin that I've seen before include "regional capital" , "I turn to the Italian city" , "Italian location" , "foreign city" , "Piedmontese capital" .)