Drunken mother's stuck in the outhouse (7)
I believe the answer is:
smashed
'drunken' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?
'mother's stuck in the outhouse' is the wordplay.
'mother's' becomes 'ma's' (ma can mean mother).
'stuck in' is an insertion indicator.
'the outhouse' becomes 'shed' (a shed is an outside building).
'mas' placed into 'shed' is 'SMASHED'.
Can you help me to learn more?
(Other definitions for smashed that I've seen before include "Broke; drunk (colloq.)" , "Broken in pieces" , "bust?" , "Broke into small pieces" , "completely sozzled" .)