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Ball of fire, perhaps currently dangerous (4,4)

Ross

I believe the answer is:

live wire

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'ball of fire' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

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(Other definitions for live wire that I've seen before include "Brown covering for this" , "isn't it shocking?" , "Conductor charged with electricity - energetic person" , "Alert and enthusiastic person" , "Energetic and unpredictable person" .)

I've seen this clue in the Evening Standard.
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