Pop group led by brothers Ron and Russell Mael (6)

I believe the answer is:

sparks

(Other definitions for sparks that I've seen before include "Fiery particles for informal electrician" , "Momentary flashes of light" , "Bright discharges" , "Fiery particles emitted by fire" , "Electricians (informal)" .)

I've seen this clue in The Independent.

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