Scrambled draw at home – he considered selection, naturally (6)
I believe the answer is:
darwin
'home he considered selection naturally' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'scrambled draw at' is the wordplay.
'scrambled' is an anagram indicator.
'at' becomes 'in' (synonymous in some cases - eg at school, in school).
'draw' with letters rearranged gives 'darw'.
'darw'+'in'='DARWIN'
Can you help me to learn more?
(Other definitions for darwin that I've seen before include "Author of On the Origin of Species, d.1882" , "Man of note" , "Charles ...... originated the theory of evolution" , "Naturalist, author" , "English naturalist, Charles (1809-82)" .)