Eject some mischievous teenagers (4)
I believe the answer is:
oust
'eject' is the definition.
(thesaurus)
'some mischievous teenagers' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'OUST' is hidden in the letters of 'mischievous teenagers'.
(Other definitions for oust that I've seen before include "Overthrow" , "Throw out" , "Remove from a position or office" , "Put out, say of office" , "Drive out, eject from office" .)