Composer getting drunk with Liszt (6)
I believe the answer is:
brahms
'composer' is the definition.
(I know that Brahms is a composer)
I can't explain the rest of the clue.
(Other definitions for brahms that I've seen before include "'Bah, Mrs, he's a composer (6)'" , "German Romantic composer" , "Musician" , "German barman" , "German scorer" .)