Author of The Twits, d. 1990 (4)

I believe the answer is:

dahl

(Other definitions for dahl that I've seen before include "Roald - - (deviser of Willy-Wonka)" , "Willy Wonka's creator" , "Roald or Sophie?" , "Roald -, Br. author" , "Indian dish of legumes and spices" .)

I've seen this clue in The Guardian.

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