Make bigger general changes (7)
I believe the answer is:
enlarge
'make bigger' is the definition.
(I've seen this before)
'general changes' is the wordplay.
'changes' indicates anagramming the letters.
'general' with letters rearranged gives 'ENLARGE'.
(Other definitions for enlarge that I've seen before include "Make greater" , "Make bigger in general" , "swell?" , "Expatiate" , "Stretch" .)