Crossword Genius

A stroke of literary genius the author promptly included in book (11,4)

Ross

I believe the answer is:

porterhouse blue

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

I cannot understand how the remainder of the clue works.

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(Other definitions for porterhouse blue that I've seen before include "book" , "A novel" .)

I've seen this clue in The Telegraph.
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