One in doctor's surgery happy to wait? (7)

I believe the answer is:

patient

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

I can't explain the rest of the clue.

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(Other definitions for patient that I've seen before include "Forgiving" , "One in hospital" , "Prepared to wait" , "Doctor's visitor; composed" , "convalescent" .)

I've seen this clue in The Guardian.

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