Crossword Genius

Words fit to air on TV programme (5,4)

Ross

I believe the answer is:

theme song

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'tv programme' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'words fit to air on' is the wordplay.
'words fit' becomes 'theme' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'to air' becomes 'song' (air can mean a piece of music).
'on' says to put letters next to each other.
'theme'+'song'='THEME SONG'

Can you help me to learn more?

(Other definitions for theme song that I've seen before include "Signature tune" , "Give me Sunshine" , "Characteristic melody often repeated in musical" .)

I've seen this clue in The Independent.
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