Compulsory (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">compulsory</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that compulsory can be written as mandatory)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for mandatory that I've seen before include "Obligatory" , "Not optional" , "allowing no option" , "Binding" , "required" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">compulsory</span>' is the definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Another definition for obligatory that I've seen is " Binding".)