Article penned by sour character not being broadcast (3,3,3)

'being broadcast' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'article penned by sour character' is the wordplay.
'article' becomes 'the' (the definite article).
'penned by' indicates putting letters inside (inserted letters are penned in).
'sour' becomes 'off' (synonyms).
'character' becomes 'air' (air can mean a character or mood).
'off'+'air'='offair'
'the' going into 'offair' is 'OFF THE AIR'.

'not' is the link.

Can you help me to learn more?