Religious adherent cheerful on announcement (5)
I believe the answer is:
sunni
This might be a double definition.
'religious' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'adherent cheerful on announcement' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
Can you help me to learn more?
(Other definitions for sunni that I've seen before include "Form of religion" , "One branch of Islam" , "Indian fig tree with aerial roots" , "Moslem" , "Member of another Muslim sect" .)