A legal breach of the barrier (7)

I believe the answer is:

offence

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'a legal breach' is the definition.
'offence' can be an answer for 'breach' (I have seen 'Breach of conduct ' mean 'offence' so perhaps 'breach' could also mean 'offence'). I'm not sure about the 'a legal' bit.

'of the barrier' is the wordplay.
'the barrier' becomes 'fence' (fence is a kind of barrier).
'of'+'fence'='OFFENCE'

Can you help me to learn more?

(Other definitions for offence that I've seen before include "Discourtesy" , "Resentment, hurt" , "Misdemeanour" , "Misdeed" , "Attack - crime" .)

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

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