Broadside (5)
I believe the answer is:
salvo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">broadside</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 "Several rounds" , "Simultaneous firing of weapons" , "Outburst, as of applause" , "Simultaneous discharge of guns" , "concentrated fire" .)