Crossword Genius

American very powerful (6)

Ross

I believe the answer is:

mighty

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This clue could be a double definition.

'american' is the first definition.
Although both the answer and definition are adjectives, I don't understand how they can define each other.

'very powerful' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for mighty that I've seen before include "Strong, powerful" , "Having great strength" , "Powerful - exalted" , "Powerful and great" , "Powerful - huge" .)

I've seen this clue in The Sun.
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