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Choice that was natural for Darwin (9)

Ross

I believe the answer is:

selection

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'choice that was natural for darwin' is the definition.
'selection' can be an answer for 'choice' (synonyms). I am unsure of the rest of the definition.

'choice that was natural' is the wordplay.
'choice' becomes 'select' (synonyms).
'that was natural' becomes 'ion' (I am not sure about this - if you are sure you should believe this answer much more).
'select'+'ion'='SELECTION'

Can you help me to learn more?

(Other definitions for selection that I've seen before include "Horse tipped for betting" , "Choice, pick" , "Act of choosing" .)

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