Partygate in magistrate's office (6)

I believe the answer is:

dogate

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'partygate' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'in magistrate's office' is the wordplay.
'in' is an insertion indicator.
'magistrate' becomes 'doge' (doge is a kind of magistrate).
'office' becomes 'at' (I can't explain this - if you can you should give a lot more credence to this answer).
'doge' placed around 'at' is 'DOGATE'.

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I've seen this clue in The Independent.

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