Blue movie of Hitchcock's right to go after terror (8)
I believe the answer is:
improper
'blue' is the definition.
(thesaurus)
'movie of hitchcock's right to go after terror' is the wordplay.
'movie of hitchcock' becomes 'rope' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'right' becomes 'r' (common abbreviation).
'to go after' says to put letters next to each other.
'terror' becomes 'imp'.
'rope'+'r'='roper'
'roper' after 'imp' is 'IMPROPER'.
Can you help me to learn more?
(Other definitions for improper that I've seen before include "Incorrect or wrong, say behaviour" , "unfit" , "Wrong - unsuitable" , "So it may appear a fraction" , "Not conforming to norms of conduct, maybe indecent" .)