Drop in from Italy (4)
I believe the answer is:
omit
'drop' is the definition.
(I've seen this before)
'in from italy' is the wordplay.
'in' indicates a hidden word.
'OMIT' can be found hidden inside 'from italy'.
(Other definitions for omit that I've seen before include "Leave out or forget" , "Fail (to do something)" , "Disregard" , "Leave out, perhaps in error" , "Fail to use" .)