Author arguing about ending of novel (7)

I believe the answer is:

rowling

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'author' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for rowling that I've seen before include "Harry Potter's creator" , "J K - - (writer)" , "J. K, author of Harry Potter stories" .)

I've seen this clue in The Telegraph.

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