Once-popular ballad sung a bit jauntily? (5)

I believe the answer is:

until

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'once-popular ballad sung' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'a bit jauntily?' is the wordplay.
'a bit' says the answer is hidden in the clue (the answer is formed by a bit of the clue).
'UNTIL' can be found hidden inside 'jauntily'.

Can you help me to learn more?

(Other definitions for until that I've seen before include "Up to that moment" , "As late as" , "Before a given time" , "Pending such time as" , "Not beyond (hour)" .)

I've seen this clue in the Evening Standard.

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