Professional champ's docile getting hammered (12)
I believe the answer is:
accomplished
'professional' is the definition.
(I've seen this before)
'champ's docile getting hammered' is the wordplay.
'getting hammered' indicates anagramming the letters.
'champs'+'docile'='champsdocile'
'champsdocile' anagrammed gives 'ACCOMPLISHED'.
(Other definitions for accomplished that I've seen before include "Achieved success" , "Talented - performed" , "Done - with a high degree of skill" , "Performed - completed - with a high degree of skill" , "Having particular skills" .)