Galvanic aspect of Thomas Edison, nominally (4)

I believe the answer is:

alva

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'thomas edison nominally' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'galvanic aspect' is the wordplay.
'ALVA' is hidden in amongst the letters.
But, I'm not sure how this is indicated.

'of' acts as a link.

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