Insouciance from song in E by couple of sopranos (8)
I believe the answer is:
airiness
'insouciance' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'song in e by couple of sopranos' is the wordplay.
'song' becomes 'air' (air can mean a piece of music).
'by' is a charade indicator (letters next to each other).
'couple of' says to double the letters.
'sopranos' becomes 's' (this might be a standard abbreviation I've not previously seen).
's' duplicated is 'ss'.
'air'+'in'+'e'+'ss'='AIRINESS'
'from' acts as a link.
Can you help me to learn more?
(Other definitions for airiness that I've seen before include "Ethereality" , "Insubstantial quality" .)