At home, mixing tea and brie, awfully 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 awfully' 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.
'awfully' indicates anagramming the letters.
'tea' is an anagram of 'ate'.
'brie' anagrammed gives 'ebri'.
'ate' put after 'ebri' is 'ebriate'.
'in'+'ebriate'='INEBRIATE'
(Other definitions for inebriate that I've seen before include "drunken state" , "Habitual drunk" , "He's drunk" , "Intoxicate" , "Drunkard" .)