Crossword Genius

Live wire possible cause of ignition? (6,5)

Ross

I believe the answer is:

bright spark

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for bright spark that I've seen before include "Clever person" , "Someone who appears (irritatingly?) clever" , "One full of ideas" , "one who has many good ideas" , "Lively and clever individual" .)

I've seen this clue in The Telegraph.
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