Lentil dish picked up for children’s author (4)

I believe the answer is:

dahl

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'children's author' is the definition.
(Roald Dahl)

I can't explain the rest of the clue.

(Other definitions for dahl that I've seen before include "Roald or Sophie?" , "British author, notably of children's books, d.1990" , "'Roald ..., children's author (4)'" , "Roald -, Br. author" , "Roald -, British writer" .)

I've seen this clue in The Times.

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