Lager nine gets drunk usually (2,7)
I believe the answer is:
in general
'usually' is the definition.
(thesaurus)
'lager nine gets drunk' is the wordplay.
'gets drunk' indicates anagramming the letters.
'lager'+'nine'='lagernine'
'lagernine' anagrammed gives 'IN GENERAL'.
(Other definitions for in general that I've seen before include "Largely" , "Commonly" , "for the most part" , "on the whole" , "Not particularly" .)