Crossword Genius

Confines within bounds rotationally, we hear (7)

Ross

I believe the answer is:

interns

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

'confines' is the definition.
(I've seen this in another clue)

'within bounds rotationally we hear' is the wordplay.
I cannot quite understand how this works, but
'within' could be 'in' and 'in' is found in the answer.
The remaining letters 'terns' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for interns that I've seen before include "Hospital residents" , "those confined" .)

I've seen this clue in The Irish Independent.
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