Volley (5)
I believe the answer is:
salvo
'volley' is the definition.
(I know that volley can be written as salvo)
This is all the clue.
(Other definitions for salvo that I've seen before include "concentrated fire" , "Fiery outburst" , "Ovals (anag)" , "Rapid simultaneous discharge of firearms" , "Ceremonial round of gunfire" .)