Military plane (6)
I believe the answer is:
bomber
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">military plane</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 bomber that I've seen before include "military plane" , "Military aircraft" , "It may be smoked" , "Aircraft designed to drop high explosives" , "terrorist" .)