Compulsory enlistment (12)
I believe the answer is:
conscription
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">compulsory enlistment</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 conscription that I've seen before include "Draft" , "Compulsory enlistment" .)