House in Split? (4)

I believe the answer is:

semi

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This clue might be a double definition.

'house' is the first definition.
(short for semi-detached)

'split?' is the second definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?

'in' is the link.

Can you help me to learn more?

(Other definitions for semi that I've seen before include "Property attached to another" , "Partly detached home" , "House; match" , "A whole house (or half?)" , "home perhaps" .)

I've seen this clue in The Sun.

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