Oil catch freely being liberal (8)
I believe the answer is:
catholic
'liberal' is the definition.
(thesaurus)
'oil catch freely' is the wordplay.
'freely' is an anagram indicator.
'oil'+'catch'='oilcatch'
'oilcatch' is an anagram of 'CATHOLIC'.
'being' is the link.
(Other definitions for catholic that I've seen before include "of interest to all" , "Chat Clio up to be Roman religion" , "Eclectic" , "All embracing" , "Universal like major Christian religion" .)