Volley of gunfire (5)
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I believe the answer is:
salvo
'volley of gunfire' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for salvo that I've seen before include "Succession of shots" , "Simultaneous discharge of artillery" , "Round of fire" , "Ceremonial shots" , "Fusillade, volley" .)