Amoral vanity's destroyed good band (9,4)
I believe the answer is:
salvation army
'good band' is the definition.
The definition and answer can be both groups as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'amoral vanity's destroyed' is the wordplay.
'destroyed' indicates anagramming the letters.
'amoral'+'vanitys'='amoralvanitys'
'amoralvanitys' is an anagram of 'SALVATION ARMY'.
Can you help me to learn more?
(Other definitions for salvation army that I've seen before include "Organisation founded by William Booth" , "peaceful force" , "The Booths' organisation" , "Christian body noted for social work and bands" , "Christian group" .)