Swell sort of general (7)
I believe the answer is:
enlarge
'swell' is the definition.
(swell can mean to get bigger)
'sort of general' is the wordplay.
'sort of' is an anagram indicator.
'general' is an anagram of 'ENLARGE'.
(Other definitions for enlarge that I've seen before include "Make greater" , "General (anag)" , "Broaden, increase" , "Amplify" , "Grow" .)