Crossword Genius

One in no undue hurry for treatment? (7)

Ross

I believe the answer is:

patient

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'one in no undue hurry' is the first definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'treatment?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

'for' is the link.

Can you help me to learn more?

(Other definitions for patient that I've seen before include "Unhurried" , "doctor's client" , "Forbearing" , "one of interest to medics?" , "One getting medical care" .)

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