Break a spell (4)
I believe the answer is:
snap
I believe this is a double definition.
'break' is the first definition.
(I know that snap is a class)
'a spell' is the second definition.
(I know that snap is a type of spell)
(Other definitions for snap that I've seen before include "give way" , "Break suddenly and cleanly" , "Cut" , "Speak irritably; photo" , "on the spur of the moment" .)