Show likely to 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')
'show likely' is the wordplay.
'show' becomes 'read' (synonyms).
'likely' becomes 'apt' (similar in meaning).
'read'+'apt'='READAPT'
'to' acts as a link.
(Other definitions for readapt that I've seen before include "make further modifications" , "Again adjust to changed conditions" , "Once again modify" , "undergo further change" , "again demonstrate versatility" .)