Crossword Genius

Is such a lantern all that brilliant? (5)

Ross

I believe the answer is:

magic

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'that brilliant?' is the definition.
(thesaurus)

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

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(Other definitions for magic that I've seen before include "Enchantment" , "Brilliant -- deception" , "Wizardry - wizard!" , "Sorcery - conjuring" , "Prestidigitation" .)

I've seen this clue in the Evening Standard.
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