Early firearm (6)
I believe the answer is:
musket
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">early firearm</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 musket that I've seen before include "[DRAGON]" , "Early infantry gun" , "Ancient shoulder-gun" , "Old type of gun" , "Muzzle-loading shoulder gun" .)