Writer's pulse (4)

I believe the answer is:

dahl

I believe this is a double definition.

'writer's' is the first definition.
(Roald Dahl)

'pulse' is the second definition.
(Indian term for split pulses)

(Other definitions for dahl that I've seen before include "Roald - - (deviser of Willy-Wonka)" , "Model" , "Roald -, British writer" , "'Roald ..., children's author (4)'" , "Willy Wonka's creator" .)

I've seen this clue in The Guardian.

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