Ceremony upsetting Rwanda church (3,5)
I believe the answer is:
war dance
'ceremony' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'upsetting rwanda church' is the wordplay.
'upsetting' indicates anagramming the letters.
'church' becomes 'ce' (Church of England).
'rwanda' with letters rearranged gives 'wardan'.
'wardan'+'ce'='WAR-DANCE'
Can you help me to learn more?
(Other definitions for war dance that I've seen before include "moves anticipating conflict?" , "Tribal ceremony before battle" , "Pre-battle ceremony" , "Steps taken by fighters" , "steps taken before engagement" .)