Staff able to achieve remarkable results! (4)
I believe the answer is:
wand
'staff' is the definition.
(I know that wand is a type of staff)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for wand that I've seen before include "Conjuror's stick" , "Magician's stick" , "Christmas tree fairy's rod" , "Fairy's stick" , "Magician's rod" .)