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 wordplay.
'notice' becomes 'ad'.
'being replaced' indicates an anagram.
'seesred' anagrammed gives 'dressee'.
'of' acts as a link.
(Other definitions for addressee that I've seen before include "He gets a letter", "Recipient of mail", "Name on envelope", "One named on summons", "One sent letter", "Person named on an envelope", "He's written to", "one who's likely to get the post", "Intended recipient of letter" and "The name on an envelope".)