What's done to criminal, I fancy, not following a particular line (15)

I believe the answer is:

omnidirectional

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'following a particular line' is the definition.
The definition suggests an adjective which matches the answer.

'what's done to criminal i fancy not' is the wordplay.
'done to criminal i' anagrams to 'OMNIDIRECTIONAL'.
However, I'm not clear how this is indicated.

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I've seen this clue in The Guardian.

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