Underworld delivered break with church (7)
I believe the answer is:
dissent
'break with church' is the definition.
I can't judge whether this definition defines the answer.
'underworld delivered' is the wordplay.
'underworld' becomes 'dis' (underworld in classical mythology).
'delivered' becomes 'sent' (I've seen this in another clue).
'dis'+'sent'='DISSENT'
Can you help me to learn more?
(Other definitions for dissent that I've seen before include "Express a different opinion" , "Opposition" , "Object" , "Objection" , "Nonconformity" .)