All the gin? Very drunk! (10)
I believe the answer is:
everything
'all' is the definition.
(thesaurus)
'the gin? very drunk' is the wordplay.
'drunk' is an anagram indicator.
'the'+'gin'+'very'='theginvery'
'theginvery' is an anagram of 'EVERYTHING'.
(Other definitions for everything that I've seen before include "The whole lot" , "All that is; life in general" , "The whole shebang" , "great deal" , "the works" .)