Banter assumed to be better when young? (8)

I believe the answer is:

badinage

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'banter' is the definition.
(I know that badinage is a type of banter)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for badinage that I've seen before include "Humorous banter" , "Raillery, give-and-take" , "A big Dane given to banter" , "Amiable banter" , "Humorous, witty conversation" .)

I've seen this clue in The Times.

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