Her sister is a superior person (5)

I believe the answer is:

nurse

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'person' is the definition.
(nurse is a kind of person)

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

(Other definitions for nurse that I've seen before include "Care for the sick" , "Nanny" , "One ministering to the sick" , "Carer for the sick; shark" , "Qualified carer" .)

I've seen this clue in The Irish News.

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