Forcing entry into investigation (5,4)

I believe the answer is:

going into

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'forcing entry into investigation' is the definition.
I can't judge whether this definition defines the answer.

'forcing entry into' is the wordplay.
'forcing entry' becomes 'going' (I can't explain this - if you can you should believe this answer much more).
'going'+'into'='GOING INTO'

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

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