Vocation, task (7)
I believe the answer is:
mission
I believe this clue is a double definition.
'vocation' is the first definition.
(thesaurus)
'task' is the second definition.
(I know that mission is a type of task)
(Other definitions for mission that I've seen before include "Special assignment" , "Very dangerous assignment -- Tom Cruise film series" , "Delegation" , "religious establishment" , "Vocation; embassy" .)