Liberal urge one's developed (8)
I believe the answer is:
generous
'liberal' is the definition.
(similar in meaning)
'urge one's developed' is the wordplay.
'developed' indicates an anagram.
'urge'+'ones'='urgeones'
'urgeones' with letters rearranged gives 'GENEROUS'.
(Other definitions for generous that I've seen before include "Munificent; liberal" , "Free" , "Giving unselfishly" , "Freely giving; larger than usual" , "Princely" .)