Youngster of minute energy (4)

I believe the answer is:

teen

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

'of minute energy' is the wordplay.
'of' indicates a hidden word.
'TEEN' is hidden within 'minute energy'.

(Other definitions for teen that I've seen before include "Adolescent, then adult-to-be" , "Youngster of a certain age" , "Youth" , "Young person" , "Adolescent (informal)" .)

I've seen this clue in The Mirror.

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