Great spelling (5)
I believe the answer is:
magic
I believe this is a double definition.
'great' is the first definition.
(both can mean very good)
'spelling' is the second definition.
(use of spells)
(Other definitions for magic that I've seen before include "Illusory feat" , "Superb" , "Supernatural power" , "Prestidigitation" , "Witchcraft" .)