In hospital, she may have a ward to herself (6)

I believe the answer is:

sister

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'in' is the definition.
Both the answer and definition are adjectives. Perhaps you can see a link between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sister that I've seen before include "Close relation" , "Tender" , "Nun's title" , "The nurse in charge" , "Martin --, film director" .)

I've seen this clue in the Evening Standard.

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