I entered dream home - in Spain suitably enough (7)

I believe the answer is:

castile

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'i' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for castile that I've seen before include "Elastic (anag) -- region of Spain" , "Old Spanish kingdom" , "Elastic region in central Spain" , "former Spanish kingdom" .)

I've seen this clue in The Globe and Mail.

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