At home, mixing tea and brie, drunk (9)
I believe the answer is:
inebriate
'drunk' is the definition.
(I know that drunk can be written as inebriate)
'at home mixing tea and brie' is the wordplay.
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'mixing' indicates an anagram.
'and' says to put letters next to each other.
'tea' put after 'brie' is 'brietea'.
'brietea' anagrammed gives 'ebriate'.
'in'+'ebriate'='INEBRIATE'
(Other definitions for inebriate that I've seen before include "Habitual drunk" , "Get drunk" , "Intoxicate" , "Make drunk" , "Being loaded" .)