A king snake looped around naturalist (6)

I believe the answer is:

darwin

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'naturalist' is the definition.
(Darwin is an example)

I can't explain the rest of the clue.

(Other definitions for darwin that I've seen before include "Charles ...... originated the theory of evolution" , "He initiated the theory of evolution" , "Charles . . . . . ., author of 'The Origin of Species'" , "Aus. N. Territory capital" , "Charles . . . . . . who formulated the theory of evolution" .)

I've seen this clue in The Independent.

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