Still one is drunk by bar (9)
I believe the answer is:
noiseless
'still' is the definition.
(thesaurus)
'one is drunk by bar' is the wordplay.
'drunk' indicates an anagram.
'by' is a charade indicator (letters next to each other).
'bar' becomes 'less' (both can mean 'not including').
'one'+'is'='oneis'
'oneis' is an anagram of 'noise'.
'noise'+'less'='NOISELESS'
(Other definitions for noiseless that I've seen before include "Lionesses (anag) - making no sound" , "Mum" , "Silent, quiet" , "with a silencer?" , "unsound?" .)