Some ogre ate Ronald, got bigger! (7)
I believe the answer is:
greater
'bigger' is the definition.
('great' can be similar in meaning to 'big')
'some ogre ate ronald' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'GREATER' can be found hidden inside 'ogre ate ronald'.
'got' is the link.
(Other definitions for greater that I've seen before include "Most of it was formerly part of 1 across" , "More extensive" , "More significant" , "more powerful" , "more imposing scale" .)