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' indicates anagramming the letters.
'general' anagrammed gives 'ENLARGE'.
(Other definitions for enlarge that I've seen before include "Make big" , "Blow up" , "scale up" , "Amplify" , "Expatiate" .)