Got a larger size (4)
I believe the answer is:
grew
'got' is the definition.
('grow' can be a synonym of 'get')
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for grew that I've seen before include "Got bigger" , "Developed, matured" , "Rose" , "Cultivated'" , "Increased in size" .)