Graduate’s home sink (5)
I believe the answer is:
basin
'sink' is the definition.
(thesaurus)
'graduate's home' is the wordplay.
'graduate's' becomes 'bas'.
'home' becomes 'in' ('he's home' can mean 'he's in'**).
'bas'+'in'='BASIN'
(Other definitions for basin that I've seen before include "Bowl-shaped vessel" , "Sink for washing" , "Large bowl" , "requirement for cleansing" , "Kitchen vessel" .)