Juggling not right, as entertainment frightening children (5,5)
I believe the answer is:
ghost train
'entertainment frightening children' is the definition.
'juggling not right as' is the wordplay.
'juggling' indicates anagramming the letters (I've seen this in other clues).
'not'+'right'+'as'='notrightas'
'notrightas' with letters rearranged gives 'GHOST TRAIN'.
(Other definitions for ghost train that I've seen before include "Spooky ride" , "scary ride" , "Fairground attraction" , "funfair ride" .)