Youngsters chill, chores done, energy gone, shattered (14)
I believe the answer is:
schoolchildren
'youngsters' is the definition.
'chill chores done energy gone shattered' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'gone' is a deletion indicator.
'shattered' indicates anagramming the letters.
'chill'+'chores'+'done'='chillchoresdone'
'chillchoresdone' with 'e' taken out is 'chillchorsdone'.
'chillchorsdone' with letters rearranged gives 'SCHOOLCHILDREN'.
(Another definition for schoolchildren that I've seen is " Pupils".)
I've seen this clue in The Independent.
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