Noble Florentine family (6)
I believe the answer is:
medici
'noble florentine family' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for medici that I've seen before include "Powerful Italian family in the 15th century" , "Name of great Florentine family 15-17th centuries" , "Noble Florentine family" , "Famous Florentine family name" , "aristocratic family" .)