Sparkle or brilliance (7)

I believe the answer is:

glitter

I believe this clue is a double definition.

'sparkle' is the first definition.
(I know that sparkle can be written as glitter)

'brilliance' is the second definition.
(thesaurus)

(Other definitions for glitter that I've seen before include "Flash" , "Are bright" , "Decorative sparkle" , "Flashiness" , "Showy decoration" .)

I've seen this clue in The Mirror.

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