American TV drama series loosely based on a series of novels by Jeff Lindsay (6)

I believe the answer is:

dexter

(Other definitions for dexter that I've seen before include "Colin -, Inspector Morse author" , "On the right-hand side in heraldry" , "In heraldry, of or on the right side" , "Crime writer" , "Breed of cattle; right" .)

I've seen this clue in The Independent.

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