Cast in “Mystified” (5)
I believe the answer is:
threw
I believe this is a double definition.
'cast' is the first definition.
(I've seen this before)
'mystified' is the second definition.
('throw' can be a synonym of 'mystify')
'in' acts as a link.
(Other definitions for threw that I've seen before include "Projected through the air" , "Propelled through the air" , "Confused" , "Chucked" , "Cast" .)