Crossword Genius

Muriel, a bright little thing (5)

Ross

I believe the answer is:

spark

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This clue could be a double definition.

'muriel' is the first definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'a bright little thing' is the second definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for spark that I've seen before include "Particle of fire" , "Fiery particle" , "Quantity of electricity" , "Tiny, red-hot particle" , "Fragment of a burning substance" .)

I've seen this clue in the Evening Standard.
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