Crossword Genius

Rabbit bucks, initially reduced by 90 percent (5)

Ross

I believe the answer is:

coney

I'm a little stuck... Click here to teach me more about this clue!

'rabbit' is the definition.
(I know that rabbit can be written as coney)

I can't explain the remainder of the clue.

Can you help me to learn more?

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