Ball of fire, perhaps currently dangerous (4,4)
I believe the answer is:
live wire
'ball of fire' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(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" .)