Crossword Genius

Financially speaking, protect jewellery dealer who’s dodgy? (4-5)

Ross

I believe the answer is:

ring-fence

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

'financially speaking' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'protect jewellery dealer who's dodgy?' is the wordplay.
I cannot really understand how this works, but
'protect' could be 'fence' (fencing is a kind of protecting) and 'fence' is found within the answer.
'jewellery' could be 'ring' (ring is a kind of jewellery) and 'ring' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ring-fence that I've seen before include "Guarantee funding" , "Allocate (funds) to one purpose" , "Encircling barrier" , "Complete barrier" , "Barrier completely enclosing an area of land" .)

I've seen this clue in The Times.
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