Scan suitable change again (7)
I believe the answer is:
readapt
'change again' is the definition.
('adapt' is an answer for 'change' so perhaps 'readapt' is OK for 'change again')
'scan suitable' is the wordplay.
'scan' becomes 'read' (synonyms).
'suitable' becomes 'apt' (apt means appropriate or fitting).
'read'+'apt'='READAPT'
(Other definitions for readapt that I've seen before include "Again adjust to changed conditions" , "Once again modify" , "make further modifications" , "undergo further change" , "again demonstrate versatility" .)