Crossword Genius

Liberal one urges reform (8)

Ross

I believe the answer is:

generous

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'liberal' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

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(Other definitions for generous that I've seen before include "Free" , "Lavish" , "Open-handed" , "Willing to give unstintingly" , "Ample" .)

I've seen this clue in The Globe and Mail and The Telegraph.
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