Greatly exclamatory novelist? (5)

I believe the answer is:

scott

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'novelist?' is the definition.
(Sir Walter Scott)

I cannot understand how the rest of the clue works.

(Other definitions for scott that I've seen before include "Sir Peter -----, ornithologist son of a great explorer" , "He died leading Antarctic expedition" , "one wanting to explore?" , "Sir Walter -, author of Guy Mannering" , "See other clues" .)

I've seen this clue in the Evening Standard.

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