Vibrant, somewhat amazing youngster (5)

I believe the answer is:

zingy

'vibrant' is the definition.
(zingy can mean vibrant or exciting)

'somewhat amazing youngster' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'ZINGY' is hidden in the letters of 'amazing youngster'.

(Another definition for zingy that I've seen is " euphoric".)

I've seen this clue in The Times.

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