Crossword Genius

Island houses (3)

Ross

I believe the answer is:

cos

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This could be a double definition.

'island' is the first definition.
(Greek island)

'houses' is the second definition.
Although both the answer and definition are plural nouns, I don't understand how they can define each other.

Can you help me to learn more?

(Other definitions for cos that I've seen before include "Island in Mediterranean" , "healthy food" , "foreign island" , "providing unsatisfactory explanation?" , "Salad ingredient" .)

I've seen this clue in the Evening Standard.
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