Magic word - say in the style of genius American claiming zenith (8)

I believe the answer is:

alakazam

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'claiming zenith' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'magic word say in the style of genius american' is the wordplay.
I cannot really see how this works, but
'american' could be 'am' (abbreviation in some contexts) and 'am' is located in the answer.
'in the style of' could be 'ala' (e.g. chicken a la King) and 'ala' is present in the answer.
This explanation may well be incorrect...

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