Introduction of ideas perhaps in race to secure house (12)

I believe the answer is:

insemination

'introduction of ideas perhaps' is the definition.

'in race to secure house' is the wordplay.
'race' becomes 'nation' (I've seen this before).
'to' says to put letters next to each other (I've seen this in other clues).
'secure house' becomes 'semi' (I've seen this before. I am not sure about the 'secure' bit.).
'nation' put after 'semi' is 'semination'.
'in'+'semination'='INSEMINATION'

I've seen this clue in The Times.

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