Scan apartment briefly and adjust once more (7)
I believe the answer is:
readapt
'adjust once more' is the definition.
('adapt' can be a synonym for 'adjust' so perhaps 'readapt' is OK for 'adjust once more')
'scan apartment briefly' is the wordplay.
'scan' becomes 'read' (synonyms).
'apartment briefly' becomes 'apt' (abbreviation in property ads for example; 'briefly' suggests a short form).
'read'+'apt'='READAPT'
'and' is the link.
(Other definitions for readapt that I've seen before include "make further modifications" , "undergo further change" , "again demonstrate versatility" , "Again adjust to changed conditions" , "Once again modify" .)