Crossword Genius

Racier, it breaks rules (8)

Ross

I believe the answer is:

criteria

'rules' is the definition.
('criterion' can be a synonym of 'rule')

'racier it breaks' is the wordplay.
'breaks' indicates anagramming the letters.
'racier'+'it'='racierit'
'racierit' is an anagram of 'CRITERIA'.

(Other definitions for criteria that I've seen before include "Principles for decision" , "Standards of judgement to be met" , "Standards, yardsticks" , "Standards on which to base judgments" , "Standards by which things measured" .)

I've seen this clue in The Telegraph.
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