The corresponding receiver (9)
I believe the answer is:
addressee
'receiver' is the definition.
(addressee is a kind of receiver)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for addressee that I've seen before include "He gets a letter" , "The one to whom the message is sent" , "Intended recipient of letter" , "Person whose name is on the envelope" , "The person to whom letter is delivered" .)