Florentine family name (6)
I believe the answer is:
medici
'florentine family name' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for medici that I've seen before include "Name of great Florentine family 15-17th centuries" , "Well-known European family" , "Florentine ruling family" , "Name of powerful Florentine family in 15th-17th centuries" , "Florentine ruler" .)