The Maori to slam motherless inventor
I believe the answer is:
tesla
'inventor' is the definition.
(scientist Nikola Tesla)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for tesla that I've seen before include "Physicist" , "Physics unit" , "Californian company specialising in electric cars" , "electrical unit" , "Inventor" .)