Clue: Like Jack in The Shining: extremely scary – chop, chop! (6)
Answer: PSYCHO
Explanation: Definition: Like Jack in The Shining
Anagram – indicated by the second "chop" – of S[car]Y + CHOP. I had some doubt about this parsing, as the CHO at the end is CHOP "chopped", but that doesn't account for the initial P, so I think I'm right. The reference is to the novel and film *The Shining* and the character Jack Torrance – played by Jack Nicholson in the film, handily