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Such twins were once inseparable (7)

Ross

I believe the answer is:

siamese

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for siamese that I've seen before include "like a cat" , "sort of twins" , "Pale breed of cat" , "Cat with slanting blue eyes and pale fur with darker points" , "cats?" .)

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