14 across
Author
named
in
expression
of
surprise
(7)
Author named in expression of surprise (7)
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The whole clue is the definition (& lit or double definition).
How the clue works
This is a double definition: Author points to Charles Dickens, while expression of surprise refers to the word 'dickens' as used in exclamations like 'what the dickens!'. Both meanings yield the same word DICKENS.