Crossword Genius

One content in queue for treatment? (7)

Ross

I believe the answer is:

patient

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

'queue for treatment?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'one content' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is present in the answer.
The remaining letters 'patent' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'in' is the link.

Can you help me to learn more?

(Other definitions for patient that I've seen before include "One in hospital" , "one of interest to medics?" , "One receiving medical care" , "Willing to wait" , "One receives medical care" .)

I've seen this clue in The Sun.
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