Increase in general fidgeting (7)
I believe the answer is:
enlarge
'increase' is the definition.
(I know that enlarge is a kind of grow)
'general fidgeting' is the wordplay.
'fidgeting' indicates anagramming the letters (letters fidget or move around).
'general' anagrammed gives 'ENLARGE'.
'in' acts as a link.
(Other definitions for enlarge that I've seen before include "Make bigger in general" , "swell?" , "Make big" , "Dilate" , "scale up" .)