Well-mannered girl broadcasting? (8)

I believe the answer is:

debonair

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'well-mannered' is the definition.
Both the answer and definition are adjectives. Maybe you can see a link between them that I can't see?

'girl broadcasting?' is the wordplay.
'girl' becomes 'deb'.
'broadcasting?' becomes 'onair' (broadcasting on the air).
'deb'+'onair'='DEBONAIR'

Can you help me to learn more?

(Other definitions for debonair that I've seen before include "I broaden out with self-confident manner" , "Having carefree, suave manner" , "The dashing" , "Elegant, courteous" , "Sprightly" .)

I've seen this clue in The Sun.

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