Sophie —, actress-model-cook who authored 2007 novel Playing with the Grown-ups (4)
I believe the answer is:
dahl
(Other definitions for dahl that I've seen before include "Roald -, British writer" , "British writer notably of children's books" , "Roald - - (deviser of Willy-Wonka)" , "Model" , "Roald -, Br. author" .)