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Expert jeweller who's in charge at the circus (10)

Ross

I believe the answer is:

ringmaster

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

'the circus' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'expert jeweller who's in charge' is the wordplay.
I cannot quite understand how this works, but
'expert' could be 'master' (master is a kind of expert) and 'master' is found in the answer.
'in' is found in the answer.
This explanation may well be incorrect...

'at' acts as a link.

Can you help me to learn more?

(Other definitions for ringmaster that I've seen before include "who cracks the whip?" , "Circus employee" , "circus performer" , "showman" , "Circus compere" .)

I've seen this clue in The Daily Express.
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