"The Cat in the Hat” author (5)
I believe the answer is:
seuss
'the cat in the hat author' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for seuss that I've seen before include "8 [DOCTOR]" , "Dr -, children's author (The Cat in the Hat)" , "Dr. --, US children's author" .)