Charming activity of bee? (8)
I believe the answer is:
spelling
This clue is a double definition.
'charming' is the first definition.
(performing spells)
'activity of bee?' is the second definition.
(spelling bee)
(Other definitions for spelling that I've seen before include "Magic" , "kind of bee?" , "Relieving" , "Naming the letters" , "Competition to list the letters of a word" .)