Italian city is toured by Father (4)
I believe the answer is:
pisa
'italian city' is the definition.
(city in Italy)
'is toured by father' is the wordplay.
'toured by' indicates putting letters inside (tour can mean to go around).
'father' becomes 'pa' (pa can mean dad or father).
'is' inserted within 'pa' is 'PISA'.
(Other definitions for pisa that I've seen before include "Italian city with leaning tower" , "City with listed building" , "listed building site" , "Place with leaning tower" , "There's a marked inclination here" .)