Perform again in sacred oratorio (4)
I believe the answer is:
redo
'perform again' is the definition.
('do' can be a synonym for 'perform' so perhaps 'redo' is OK for 'perform again')
'in sacred oratorio' is the wordplay.
'in' indicates a hidden word.
'REDO' can be found hidden inside 'sacred oratorio'.
(Other definitions for redo that I've seen before include "Redecorate or repeat action" , "Fashion again" , "Make anew" , "Create again" , "Perform (action) again" .)