Electricity source (3)
'electricity source' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for battery that I've seen before include "One may be charged" , "Personal attack" , "Storage cell" , "Device that converts chemical energy into electrical energy" , "violent offence" .)
(Other definitions for generator that I've seen before include "juice maker" , "Electricity producer" , "Creator" , "Existing in name only" , "Power source" .)
'electricity source' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dam that I've seen before include "Barrier to hold back water" , "Hold back; mother" , "Water retainer" , "Water barrier, quite mad" , "A mad sort of mum" .)