Infamous Italian family name (6)
I believe the answer is:
borgia
'infamous italian family name' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for borgia that I've seen before include "Notorious papal family" , "Italian house" , "Lucrezia --, a Pope's daughter" , "Notorious Italian mediaeval family" , "Name of famous Italian family, with Cesare and Lucrezia" .)