Sacred chamber not yet paid for (8)
I believe the answer is:
hallowed
'sacred' is the definition.
('hallowed' can be similar in meaning to 'sacred')
'chamber not yet paid for' is the wordplay.
'chamber' becomes 'hall' (I've seen this before).
'not yet paid for' becomes 'owed'.
'hall'+'owed'='HALLOWED'
(Other definitions for hallowed that I've seen before include "Revered" , "Made holy and honoured" , "Consecrated, blessed" , "Made blessed" , "Honoured as holy like 1 Down" .)