Crossword Genius

Something ring-shaped is a sign, we hear (5)

Ross

I believe the answer is:

torus

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

'something ring-shaped' is the definition.
(I've seen this in another clue)

'sign we hear' is the wordplay.
I cannot quite understand how this works, but
'we' could be 'us' and 'us' is present in the answer.
The remaining letters 'tor' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'is a' is the link.

Can you help me to learn more?

(Other definitions for torus that I've seen before include "Ring-shaped object" , "Doughnut-shaped figure" , "Doughnut-shaped solid" , "Architectural moulding" , "Ring shaped like doughnut with hole" .)

I've seen this clue in The Daily Express.
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