City where the carioca may have started? (5)
I believe the answer is:
cairo
'city' is the definition.
(Cairo is an example)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for cairo that I've seen before include "Egypt's capital" , "Egyptian capital" , "Al Qahira" , "African city" , "Port upstream from the Nile delta" .)