Disorderly drunk sups root beer (12)
I believe the answer is:
obstreperous
'disorderly' is the definition.
(thesaurus)
'drunk sups root beer' is the wordplay.
'drunk' indicates anagramming the letters.
'sups'+'root'+'beer'='supsrootbeer'
'supsrootbeer' with letters rearranged gives 'OBSTREPEROUS'.
(Other definitions for obstreperous that I've seen before include "Bolshie" , "Noisily aggressive" , "Noisy, hard to control" , "Noisily defiant" , "Sober posture (anag) - unruly" .)