Energetic person (6)
'energetic person' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for live wire that I've seen before include "Alert and enthusiastic person" , "A person with intense energy" , "Very sparky person" , "isn't it shocking?" , "Conductor charged with electricity - energetic person" .)
'energetic person' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dynamo that I've seen before include "Electricity generator or energetic person" , "energetic individual" , "Electricity generator or vigorous person" , "Tirelessly energetic type" , "Converter of mechanical to electrical energy" .)