Revolution engulfing one European city (5)
I believe the answer is:
turin
'european city' is the definition.
(Italian city)
'revolution engulfing one' is the wordplay.
'revolution' becomes 'turn' (revolution can mean a turn or rotation).
'engulfing' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'turn' going around 'i' is 'TURIN'.
(Other definitions for turin that I've seen before include "Italian city with famous religious Shroud" , "City of north Italy" , "Piedmontese capital" , "14 Italian city" , "It. city housing shroud" .)