Muriel, that bright novelist (5)

I believe the answer is:

spark

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'muriel that bright novelist' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for spark that I've seen before include "bit of fire?" , "Fragment of a burning substance" , "Electrical discharge" , "Fiery particle" , "Particle of fire" .)

I've seen this clue in the Evening Standard.

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