Crossword Genius

Exploitative profit-maker beside a horse-drawn carriage (4)

Ross

I believe the answer is:

arba

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'carriage' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for arba that I've seen before include "Rudimentary carriage" , "Wagon" , "Asian carriage" , "carriage from Asia" .)

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