Go round one European city (5)
I believe the answer is:
turin
'european city' is the definition.
(Italian city)
'go round one' is the wordplay.
'go' becomes 'turn' (as in one's go or turn in a game).
'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 "14 Italian city" , "City of north Italy" , "First capital in 1861 of united Italy" , "N. Italian industrial city" , "Italian destination" .)