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