Blow up a rebellious general? (7)
I believe the answer is:
enlarge
'blow up' is the definition.
(synonyms)
'a rebellious general?' is the wordplay.
'a rebellious' is an anagram indicator.
'general' is an anagram of 'ENLARGE'.
(Other definitions for enlarge that I've seen before include "Make big" , "Blow up" , "scale up" , "Amplify" , "Expatiate" .)