At home with half-sister in Bury (5)
I believe the answer is:
inter
'bury' is the definition.
(to inter is to put into the ground)
'at home with half-sister' is the wordplay.
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'with' is a charade indicator (letters next to each other).
'half' suggests halving the letters.
'sister' cut in half is 'ter'.
'in'+'ter'='INTER'
'in' acts as a link.
(Other definitions for inter that I've seen before include "foreign team" , "Put underground" , "Cover" , "Bury - Milan football club" , "Put under the earth" .)