Prison band causing upset (8)
I believe the answer is:
stirring
'upset' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'prison band' is the wordplay.
'prison' becomes 'stir' (informal term for prison).
'band' becomes 'ring' (a ring is a band of metal).
'stir'+'ring'='STIRRING'
'causing' is the link.
Can you help me to learn more?
(Other definitions for stirring that I've seen before include "Arousing strong feeling" , "Rousing (using a spoon?)" , "Heady" , "Rousing; mixing" , "causing trouble" .)