Angry tirade by star, one performing a religious ceremony (9)
I believe the answer is:
celebrant
'one performing a religious ceremony' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'angry tirade by star' is the wordplay.
'angry tirade' becomes 'rant' (I've seen this before).
'by' is a charade indicator (letters next to each other).
'star' becomes 'celeb' (I've seen this before).
'rant' put after 'celeb' is 'CELEBRANT'.
Can you help me to learn more?
(Other definitions for celebrant that I've seen before include "One performing a rite" , "An officiating priest, especially at Eucharist" , "person performing rite" .)