Crossword Genius

Popular part in law-breaking (10)

Ross

I believe the answer is:

infraction

'law-breaking' is the definition.
(infraction is a kind of law-breaking)

'popular part' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'part' becomes 'fraction' (fraction is a kind of part).
'in'+'fraction'='INFRACTION'

'in' is the link.

(Other definitions for infraction that I've seen before include "transgression" , "Violation of law" , "Breach of agreement" .)

I've seen this clue in the Sydney Morning Herald.
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