Naturalist sketch almost having repelled artist (6)
I believe the answer is:
darwin
'naturalist' is the definition.
(Darwin is an example)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for darwin that I've seen before include "Charles ... who put forward theory of evolution" , "Australia's northernmost state capital" , "Evolutionary pioneer" , "Naturalist with a theory on evolution" , "Naturalist, author" .)