Deprive of weapons (6)
(Other definitions for disarm that I've seen before include "Mollify or remove weapon from" , "Deprive of weapons or win over" , "Demilitarise" , "Defuse" , "Pacify" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">deprive of weapons</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for unarm that I've seen before include "Disable" , "Deprive of a weapon" , "Render harmless" , "Remove firing pieces" , "Deactivate" .)