Arab will be in Italy tomorrow, dropping off daughter (5)
I believe the answer is:
omani
'arab' is the definition.
(someone from Oman)
'in italy tomorrow dropping off daughter' is the wordplay.
'in italy tomorrow' becomes 'domani' ('tomorrow' in Italian).
'dropping off' is a deletion indicator.
'daughter' becomes 'd' (genealogical abbreviation).
'domani' with 'd' taken away is 'OMANI'.
'will be' acts as a link.
(Other definitions for omani that I've seen before include "Middle Easterner" , "M East person" , "Gulf Arab" , "Middle East national" , "From an Arabian country, capital Muscat" .)