Revolution involving one Italian city (5)
I believe the answer is:
turin
'italian city' is the definition.
(I know that Turin is Italian)
'revolution involving one' is the wordplay.
'revolution' becomes 'turn' (I've seen this in another clue).
'involving' indicates putting letters inside.
'one' becomes 'i' (Roman numeral).
'turn' placed around 'i' is 'TURIN'.
(Other definitions for turin that I've seen before include "source of many Italian cars" , "Italian destination" , "foreign city" , "First capital in 1861 of united Italy" , "N. Italian industrial city" .)