Oddly it draws in a believer in natural selection (9)
I believe the answer is:
darwinist
'a believer in natural selection' is the definition.
(believer in Charles Darwin's theories)
'oddly it draws in' is the wordplay.
'oddly' indicates anagramming the letters.
'it'+'draws'+'in'='itdrawsin'
'itdrawsin' anagrammed gives 'DARWINIST'.
(Other definitions for darwinist that I've seen before include "believer in natural selection" , "Evolutionary scientist" , "Believer in evolution" , "With one appreciating what's needed for survival" , "Supporter of Charles" .)