Chorale performance spreads rapidly! (7)
I believe the answer is:
cholera
'chorale performance spreads rapidly' is the definition.
I can't judge whether this definition defines the answer.
'chorale performance' is the wordplay.
'performance' is an anagram indicator.
'chorale' is an anagram of 'CHOLERA'.
Can you help me to learn more?
(Other definitions for cholera that I've seen before include "Disease contracted from infected water" , "Infectious and often fatal Asiatic disease" , "bacterial disease" , "Acute intestinal infection from contaminated water or food" , "could kill you" .)