Noble and casual swallowed up in Alien with energy from top down (7)

I believe the answer is:

exalted

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'noble' is the definition.
(similar in meaning)

I don't understand how the rest of the clue works.

(Other definitions for exalted that I've seen before include "Raised high in power or dignity" , "Elevated in nature or style" , "Lifted in praise" , "Elevated and glorified" , "Raised high, glorified" .)

I've seen this clue in The Irish Times.

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