Great brilliance (7)
I believe the answer is:
bravura
'great brilliance' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bravura that I've seen before include "Virtuosity" , "Brilliant performance as in music, sounds bold" , "Spirit and dash in music" , "Panache; daring" , "Brilliance - dash" .)