Room in a hospital department accommodating dishevelled tramp (9)
I believe the answer is:
apartment
'room' is the definition.
(thesaurus)
'a hospital department accommodating dishevelled tramp' is the wordplay.
'hospital department' becomes 'ent'.
'accommodating' means one lot of letters goes inside another.
'dishevelled' indicates an anagram.
'a'+'ent'='aent'
'tramp' is an anagram of 'partm'.
'aent' placed around 'partm' is 'APARTMENT'.
'in' acts as a link.
(Other definitions for apartment that I've seen before include "Flat (chiefly US)" , "quarters" , "19 across" , "Flat (mainly US)" , "property" .)