Cariocan city (3)

I believe the answer is:

rio

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

'city' is the definition.
(Rio de Janeiro)

'cariocan' is the wordplay.
'RIO' is hidden in amongst the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for rio that I've seen before include "- Ferdinand, footballer" , "A Mexican river - like Grande" , "Erstwhile home of Biggs" , "Brazilian city and port" , "Location of next Olympic Games, in short" .)

I've seen this clue in the Evening Standard.

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