One who rescues various characters (7)
I believe the answer is:
saviour
'one who rescues' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'various characters' is the wordplay.
'characters' indicates anagramming the letters.
'various' with letters rearranged gives 'SAVIOUR'.
Can you help me to learn more?
(Other definitions for saviour that I've seen before include "One who delivers people from harm or danger" , "preservative type" , "Rescuer" , "Round, flat plate" , "Deliverer or redeemer" .)