Liberal one urges reform (8)
I believe the answer is:
generous
'liberal' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for generous that I've seen before include "Free" , "Lavish" , "Open-handed" , "Willing to give unstintingly" , "Ample" .)