Swiss city takes in one Italian artist (7)
I believe the answer is:
bernini
'italian artist' is the definition.
(I've seen this before)
'swiss city takes in one' is the wordplay.
'swiss city' becomes 'bern'.
'takes' says to put letters next to each other.
'one' becomes 'i' (Roman numeral).
'bern'+'in'+'i'='BERNINI'
(Other definitions for bernini that I've seen before include "Italian artist and sculptor" , "Italian baroque architect" , "Italian seventeenth century sculptor, architect and painter" , "Italian sculptor who worked in Rome" , "Italian sculptor of several landmarks of Rome" .)