Heavy weapons (9)
I believe the answer is:
artillery
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heavy weapons</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 artillery that I've seen before include "Missile-launchers and the like" , "Ordnance" , "Guns, cannons etc" , "Large-calibre guns" , "Heavy guns" .)