Liberal urges one to change (8)
I believe the answer is:
generous
'liberal' is the definition.
('generous' can be similar in meaning to 'liberal')
'urges one to change' is the wordplay.
'to change' indicates anagramming the letters.
'urges'+'one'='urgesone'
'urgesone' anagrammed gives 'GENEROUS'.
(Other definitions for generous that I've seen before include "Freely giving; larger than usual" , "Giving unselfishly" , "Bountiful, unselfish" , "Lavish" , "Showing largess" .)