Artillery discharge (5)
I believe the answer is:
salvo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">artillery discharge</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for salvo that I've seen before include "Rapid simultaneous shooting" , "Series of shots" , "Aussie evangelist" , "A volley of shots, perhaps as salute" , "Succession of shots" .)