How some spell broomstick? (10)
I believe the answer is:
witchcraft
I believe this is a double definition.
'how some spell' is the first definition.
(means of casting spells)
'broomstick?' is the second definition.
(I've seen this before)
(Other definitions for witchcraft that I've seen before include "Magic" , "[OBI], say" , "Supernatural power" , "Frank Sinatra single" , "Sorcery skill" .)