Never say die. Each used to gossip (7,8)
I believe the answer is:
hearsay evidence
'gossip' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'never say die each used' is the wordplay.
'used' is an anagram indicator.
'never'+'say'+'die'+'each'='neversaydieeach'
'neversaydieeach' is an anagram of 'HEARSAY EVIDENCE'.
'to' acts as a link.
Can you help me to learn more?
(Another definition for hearsay evidence that I've seen is " Testimony not based on direct knowledge".)