Harassment not unknown by academic staff, scandal for Oxford? (10,4)

I believe the answer is:

bullingdon club

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'harassment not unknown' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'academic staff scandal for oxford?' is the wordplay.
I cannot quite see how this works, but
'academic' could be 'don' (type of academic - especially at Oxbridge) and 'don' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

'by' acts as a link.

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I've seen this clue in The Guardian.

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