Entomb (5)
'entomb' is the definition.
(I know that entomb can be written as inter)
This is the entire clue.
(Other definitions for inter that I've seen before include "set underground" , "Inhume" , "foreign footballers" , "Entomb" , "Nitre (anag.)" .)
(Other definitions for inurn that I've seen before include "secure The Ashes" , "put in vessel" , "Bury" .)