Setting for aria or air to new love (8)
I believe the answer is:
oratorio
'setting for aria' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'or air to new love' is the wordplay.
'new' is an anagram indicator.
'love' becomes 'o' (love means zero in tennis).
'air'+'to'='airto'
'airto' is an anagram of 'atori'.
'or'+'atori'+'o'='ORATORIO'
Can you help me to learn more?
(Other definitions for oratorio that I've seen before include "Musical composition for voices, chorus and orchestra with biblical theme" , "Musical work for orchestra and voices" , "Work performed by choir" , "I, too, roar at sacred music" , "E.g. Messiah or Elijah" .)