Youngster of dissolute energy (4)

I believe the answer is:

teen

'youngster' is the definition.
(I've seen this before)

'of dissolute energy' is the wordplay.
'of' indicates the answer is hidden within the clue.
'TEEN' is hidden in the letters of 'dissolute energy'.

(Other definitions for teen that I've seen before include "Youngster of a certain age" , "Of 13 to 19 year olds" , "Youth" , "Juvenile" , "Adolescent, then adult-to-be" .)

I've seen this clue in The Mirror.

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