City one enters in turn (5)
I believe the answer is:
turin
'city' is the definition.
(Turin is an example)
'one enters in turn' is the wordplay.
'one enters' becomes 'i' (I can't explain this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'i' inserted into 'turn' is 'TURIN'.
Can you help me to learn more?
(Other definitions for turin that I've seen before include "Industrial city in northwest Italy" , "First capital in 1861 of united Italy" , "Italian location" , "14 Italian city" , "Italian destination" .)