Crossword Genius

Most naughty one in run on street (7)

Ross

I believe the answer is:

raciest

'most naughty' is the definition.
('racy' can be a synonym of 'naughty')

'one in run on street' is the wordplay.
'one' becomes 'i' (Roman numeral).
'in' indicates putting letters inside.
'run' becomes 'race' ('race' can be a synonym of 'run'**).
'on street' becomes 'st' (I've seen this in other clues).
'i' going within 'race' is 'racie'.
'racie'+'st'='RACIEST'

(Another definition for raciest that I've seen is " Ice star (anag)".)

I've seen this clue in The Telegraph.
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