Excellent spelling! (5)
I believe the answer is:
magic
I believe this clue is a double definition.
'excellent' is the first definition.
(thesaurus)
'spelling' is the second definition.
(use of spells)
(Other definitions for magic that I've seen before include "Enchanting quality" , "Wonderful" , "Unexpectedly produce" , "Necromancy" , "Great" .)