Crossword Genius

Hospital doctor required in sudden bout of illness, we hear (6)

Ross

I believe the answer is:

intern

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

'hospital doctor' is the definition.
'intern' can be an answer for 'doctor' (intern is a kind of doctor). I'm not sure about the 'hospital' bit.

'in sudden bout of illness we hear' is the wordplay.
I cannot quite understand how this works, but
'in' is within the answer.
The remaining letters 'tern' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'required' is the link.

Can you help me to learn more?

(Other definitions for intern that I've seen before include "Imprison (eg, alien) as a precautionary measure" , "Houseman" , "Supervised medical graduate" , "Confine as a prisoner" , "Deprive of freedom" .)

I've seen this clue in The Irish Independent.
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