Former Hollywood actor appearing in bizarre event (5)
I believe the answer is:
reeve
'former hollywood actor' is the definition.
(actor Christopher Reeve)
'in bizarre event' is the wordplay.
'in' indicates the answer is hidden within the clue.
'REEVE' is hidden within 'bizarre event'.
'appearing' is the link.
(Other definitions for reeve that I've seen before include "Former official - female ruff" , "Chief magistrate (hist.); pass (rope) through hole" , "Chief magistrate of a district" , "Former magistrate" , "Medieval official - pass rope through an eye" .)