Sees sadder type of recipients (10)

I believe the answer is:

addressees

'recipients' is the definition.
(addressee is a kind of recipient)

'sees sadder type' is the wordplay.
'type' indicates anagramming the letters.
'sees'+'sadder'='seessadder'
'seessadder' is an anagram of 'ADDRESSEES'.

'of' is the link.

(Another definition for addressees that I've seen is " Group getting letters".)

I've seen this clue in The Telegraph.

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