Crossword Genius

Confine to borders of Californian sage (4)

Ross

I believe the answer is:

cage

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This could be a double definition.

'confine' is the first definition.
(caging is a kind of confining)

'borders of californian sage' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for cage that I've seen before include "Eg, aviary" , "he used to write down scores" , "Coop" , "US composer -- barred enclosure" , "Tffhe goal in ice hockey" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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