Crossword Genius

Thing used by jewellers to examine ring, we hear (5)

Ross

I believe the answer is:

loupe

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

'thing used by jewellers to examine' is the definition.
I can't judge whether this defines the answer.

'ring we hear' is the wordplay.
'ring' becomes 'loop' (I've seen this before).
'we hear' shows a homophone (sound like).
'loop' sounds like 'LOUPE'.

Can you help me to learn more?

(Other definitions for loupe that I've seen before include "instrument in view of fine work" , "Jeweller's magnifying glass" , "Jeweller's eyeglass" , "Jeweller's eyepiece" .)

I've seen this clue in The Independent.
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