Smashing sorcerer (6)
I believe the answer is:
wizard
I believe this is a double definition.
'smashing' is the first definition.
(thesaurus)
'sorcerer' is the second definition.
('wizard' can be a synonym of 'sorcerer')
(Other definitions for wizard that I've seen before include "Ripping" , "Magician, sorcerer" , "A magician, perhaps from Oz" , "Man of magic" , "Warlock" .)