Intended recipient of notice sees red, being replaced (9)
I believe the answer is:
Here is my best explanation:
'intended recipient' is the definition.
(I've seen this before)
'notice sees red being replaced' is the subsidiary indication.
'notice' becomes 'ad'.
'being replaced' indicates an anagram.
'seesred' with letters rearranged gives 'dressee'.
'of' is the link.
(Other definitions for addressee that I've seen before include "Letter recipient", "The name on an envelope", "To whom letter is sent", "Intended recipient", "Recipient of mail", "Person named on an envelope", "The one to whom the message is sent", "Person whose name is on the envelope", "Recipient of letter" and "The person to whom letter is delivered".)