Narrow division of motorway shortened in European city (5)
I believe the answer is:
milan
'european city' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for milan that I've seen before include "European city" , "Capital of Lombardy" , "town" , "N. Italian city" , "Northern Italian city" .)