Crossword Genius

Insouciance from song in E by couple of sopranos (8)

Ross

I believe the answer is:

airiness

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'insouciance' is the definition.
Although both the answer and definition are singular nouns, I cannot understand 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' means one lot of letters go next to another.
'couple of' says to double the letters.
'sopranos' becomes 's' (this might be a standard abbreviation of which I'm unaware).
's' duplicated is 'ss'.
'air'+'in'+'e'+'ss'='AIRINESS'

'from' is the link.

Can you help me to learn more?

(Other definitions for airiness that I've seen before include "Ethereality" , "Insubstantial quality" .)

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