Salvo (6)
I believe the answer is:
volley
'salvo' is the definition.
(I know that salvo can be written as volley)
This is all the clue.
(Other definitions for volley that I've seen before include "Lovely kind of tennis stroke" , "Cannonade" , "Shot played before the ball bounces" , "Simultaneous discharge of a number of firearms" , "Tennis, football, shot" .)