Place to sleep in empty room after party (4)
I believe the answer is:
dorm
'place to sleep' is the definition.
(short for dormitory)
'empty room after party' is the wordplay.
'empty' says to hollow out the word (remove centre letters).
'after' says to put letters next to each other.
'party' becomes 'do' (do is a kind of party).
'room' with its centre taken out is 'rm'.
'rm' after 'do' is 'DORM'.
'in' acts as a link.
(Other definitions for dorm that I've seen before include "Communal bedroom in boarding school" , "place to sleep" , "where several people can sleep" , "Where retired people may be seen" , "Communal bedroom (abbr)" .)