Go round one Italian city (5)
I believe the answer is:
turin
'italian city' is the definition.
(I've seen this before)
'go round one' is the wordplay.
'go' becomes 'turn' ('turn' can be a synonym of 'go'**).
'round' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'turn' going around 'i' is 'TURIN'.
(Other definitions for turin that I've seen before include "Italian destination" , "North Italian city" , "regional capital" , "City of north Italy" , "Italian city with famous religious Shroud" .)