Retire having abandoned one North European city (5)
I believe the answer is:
turin
'european city' is the definition.
(Italian city)
'retire having abandoned one north' is the wordplay.
'retire' becomes 'turn in' (turn in can mean to retire or go to bed).
'having abandoned' suggests deleting specific letters.
'one north' becomes 'N' (abbreviation).
'turnin' with 'n' taken out is 'TURIN'.
(Other definitions for turin that I've seen before include "Italian city with sacred Christian Shroud" , "foreign city" , "North Italian city" , "Industrial city in northwest Italy" , "City of north Italy" .)