Celebrated in bar till sozzled (9)
I believe the answer is:
brilliant
'celebrated' is the definition.
(thesaurus)
'in bar till sozzled' is the wordplay.
'sozzled' indicates anagramming the letters.
'in'+'bar'+'till'='inbartill'
'inbartill' is an anagram of 'BRILLIANT'.
(Other definitions for brilliant that I've seen before include "Superb" , "Vivid; clever" , "'Wonderful, dazzling (9)'" , "Very bright or vivid" , "Shining intensly" .)