Crossword Genius

Person shrewd, collecting our rent in oppressive manner (9)

Ross

I believe the answer is:

onerously

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'person shrewd collecting our rent' is the definition.
I can't tell whether this definition defines the answer.

'oppressive manner' is the wordplay.
'oppressive' becomes 'onerous' (I've seen this before).
'manner' becomes 'ly' (I can't explain this - if you can you should believe this answer much more).
'onerous'+'ly'='ONEROUSLY'

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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