Stones in road in stockbroker belt (4)

I believe the answer is:

kerb

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'stones in road' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'in stockbroker belt' is the wordplay.
'in' indicates a hidden word.
'KERB' is hidden in the letters of 'stockbroker belt'.

Can you help me to learn more?

(Other definitions for kerb that I've seen before include "Pancakes" , "Pavement edging" , "Stone edging to footpath" , "Pavement's edge" , "Edge of road" .)

I've seen this clue in The Times and The Sun.

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