No source of success in mindlessly following Liberal (6)
I believe the answer is:
lavish
'liberal' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for lavish that I've seen before include "Prodigal - unrestrained" , "Profusely generous" , "shower" , "Sumptuous" , "Plentiful or munificent" .)