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Criminal erring, I assert, with street cordoned off -- it's an offence (9,6)

Ross

I believe the answer is:

resisting arrest

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'cordoned off it's an offence' is the definition.
I can't judge whether this defines the answer.

'criminal erring i assert with street' is the wordplay.
'criminal' indicates anagramming the letters.
'with' is an insertion indicator.
'street' becomes 'st'.
'erring'+'i'+'assert'='erringiassert'
'erringiassert' with letters rearranged gives 'resiingarrest'.
'resiingarrest' going around 'st' is 'RESISTING ARREST'.

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I've seen this clue in The Telegraph.
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