Home failing to accommodate Oscar or Bill (7)
I believe the answer is:
invoice
'bill' is the definition.
(I know that bill can be written as invoice)
'home failing to accommodate oscar' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'failing' becomes 'vice' (a moral failing).
'to accommodate' indicates putting letters inside.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'vice' enclosing 'o' is 'voice'.
'in'+'voice'='INVOICE'
'or' is the link.
(Other definitions for invoice that I've seen before include "Demand for payment" , "Statement of account" , "Statement of money owed" , "List of goods sold" , "Demand for sum due" .)