Getting pregnant achievable by half of people? (12)

I believe the answer is:

insemination

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'getting pregnant' is the definition.
I can't judge whether this definition defines the answer.

'achievable by half of people?' is the wordplay.
'achievable' becomes 'in' (I am not sure about this - if you are sure you should believe this answer much more).
'by' means one lot of letters go next to another.
'half of' becomes 'semi' (as in a semi-circle).
'people?' becomes 'nation'.
'in'+'semi'+'nation'='INSEMINATION'

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I've seen this clue in The Independent.

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