Hack potentially taking down Leavitt’s fake news (13)

I believe the answer is:

horsefeathers

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'leavitt's fake news' is the definition.
I can't judge whether this defines the answer.

'hack potentially taking down' is the wordplay.
'hack potentially' becomes 'horse' (I am not sure about this - if you are sure you should believe this answer much more).
'taking' is a charade indicator (letters next to each other).
'down' becomes 'feathers' (down can mean bird feathers).
'horse'+'feathers'='HORSEFEATHERS'

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