Author's metaphor nun grasped, only partly (7)

I believe the answer is:

hornung

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'author's' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'metaphor nun grasped only partly' is the wordplay.
'only partly' says the answer is hidden in the clue.
'HORNUNG' is hidden in the letters of 'metaphor nun grasped'.

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I've seen this clue in The Telegraph.

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