Waiting - in a waiting room? (7)

I believe the answer is:

patient

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'waiting in a waiting room?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for patient that I've seen before include "Unhurried" , "Person requiring medical care" , "Cool" , "Doctor's visitor; composed" , "Sufferer" .)

I've seen this clue in The Irish Independent.

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