Wicked Olympic city unfortunately unsafe to tour (9)

I believe the answer is:

nefarious

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'wicked' is the definition.
(similar in meaning)

'olympic city unfortunately unsafe to tour' is the wordplay.
'olympic city' becomes 'rio' (Rio de Janeiro. I am not sure about the 'olympic' bit.).
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'to tour' indicates putting letters inside (to tour can mean to go around).
'unsafe' with letters rearranged gives 'nefaus'.
'rio' put into 'nefaus' is 'NEFARIOUS'.

Can you help me to learn more?

(Other definitions for nefarious that I've seen before include "Extremely wicked" , "immoral?" , "Wicked, criminal" , "Very bad" , "Villainous" .)

I've seen this clue in The Times.

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