Proctored event (4)
I believe the answer is:
exam
'proctored event' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for exam that I've seen before include "In brief, a test as in school" , "Set of questions evaluating skill or knowledge, in short" , "Student test" , "One taken by candidate" , "Oral maybe" .)