Brass flourish (7)
I believe the answer is:
fanfare
'brass flourish' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for fanfare that I've seen before include "Ostentatious display" , "Flourish of trumpets" , "Short ceremonial tune for trumpets" , "Short piece of music played on brass instruments (for the Common Man?)" , "Trumpet call" .)