Shadow I ignored in part of Italy (5)
I believe the answer is:
umbra
'shadow' is the definition.
(I know that umbra is a type of shadow)
'i ignored in part of italy' is the wordplay.
'ignored in' suggests deleting specific letters.
'part of italy' becomes 'umbria' (Italian region).
'umbria' with 'i' removed is 'UMBRA'.
(Other definitions for umbra that I've seen before include "Dark region" , "shady region" , "Burma (anag.)" , "Dark shadow cast by earth in eclipse" , "Area of total shadow" .)