Killed in battle (6)
I believe the answer is:
fallen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">killed in battle</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 fallen that I've seen before include "ruined" , "Immoral" , "Having sinned or surrendered" , "Tumbled" , "Seduced" .)