Mean bit of sorcery (5)
I believe the answer is:
spell
This clue is a double definition.
'mean' is the first definition.
(eg in 'this spells disaster')
'bit of sorcery' is the second definition.
(I've seen this in another clue)
(Other definitions for spell that I've seen before include "influence" , "something to cast" , "Short time - magical incantation" , "Magic incantation" , "term" .)