Hitchcock's speciality (8)
I believe the answer is:
suspense
'hitchcock's speciality' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for suspense that I've seen before include "State of nervous uncertainly" , "Uneasy uncertainty" , "Hitchcock's speciality" , "Uncertain anticipation" , "State of uncertainty or excitement" .)