Chamberlain, from time back, keeping confident (9)
I believe the answer is:
treasurer
'chamberlain' is the definition.
(thesaurus)
'time back keeping confident' is the wordplay.
'time' becomes 't' (abbreviation).
'back' becomes 'rear' (synonyms).
'keeping' is an insertion indicator.
'confident' becomes 'sure' (similar in meaning).
'rear' going around 'sure' is 'reasurer'.
't'+'reasurer'='TREASURER'
'from' acts as a link.
(Other definitions for treasurer that I've seen before include "Financial officer" , "Official in charge of finances" , "Society official" , "Finance expert" , "position in society?" .)