Compulsory (9)
'compulsory' is the definition.
(I know that compulsory can be written as mandatory)
This is all the clue.
(Other definitions for mandatory that I've seen before include "Obligatory" , "Not optional" , "allowing no option" , "Binding" , "required" .)
'compulsory' is the definition.
(similar in meaning)
This is all the clue.
(Another definition for obligatory that I've seen is " Binding".)