Human powerhouse (6)
I believe the answer is:
dynamo
'human powerhouse' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dynamo that I've seen before include "Converter of mechanical to electrical energy" , "Producer of electrical energy" , "Energetic person (colloq.)" , "Device producing electrical power" , "Source of electric current" .)