Writer's book contains clever mixed metaphors (3,6)

I believe the answer is:

tom sharpe

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'writer's book contains clever' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'mixed metaphors' is the wordplay.
'mixed' is an anagram indicator.
'metaphors' with letters rearranged gives 'TOM SHARPE'.

Can you help me to learn more?

(Another definition for tom sharpe that I've seen is " "Porterhouse Blue" author".)

I've seen this clue in The Guardian.

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