Become bigger (4)
'become bigger' is the definition.
(synonyms)
This is all the clue.
(Other definitions for grow that I've seen before include "Become bigger" , "Develop - propagate" , "Multiply" , "Mature" , "Swell" .)
'become bigger' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for increase that I've seen before include "Make larger in a sincere way" , "Become greater in number" , "Grow greater" , "step up" , "extra money at work" .)