Vocal restaurant patron bristles when fusing live wire? (6)

I believe the answer is:

dynamo

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'live wire?' is the definition.
(both can mean an energetic person)

I don't understand the rest of the clue.

(Other definitions for dynamo that I've seen before include "It generates electricity" , "Producer of electrical energy" , "activist?" , "Small generator" , "Energy converter - hard worker" .)

I've seen this clue in the Sydney Morning Herald.

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