Witch work (5)
I believe the answer is:
spell
'witch work' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spell that I've seen before include "Charm; short period" , "Name in order the letters of the alphabet involved" , "Magical charm; short time" , "Magic words - period of time" , "Write letters correctly" .)