Crossword Genius

Disorderly carnival city, from our perspective (7)

Ross

I believe the answer is:

riotous

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

'disorderly' is the definition.
(synonyms)

'carnival city from our perspective' is the wordplay.
I cannot quite understand how this works, but
'city' could be 'rio' (Rio de Janeiro) and 'rio' is found within the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for riotous that I've seen before include "Boisterous and unrestrained" , "Involving public disorder" , "Of mob, disorderly and unruly" , "Rollicking" , "Unruly U rebellious" .)

I've seen this clue in The Times.
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