So our men are becoming really large (8)
I believe the answer is:
enormous
'really large' is the definition.
'enormous' can be an answer for 'large' (similar in meaning). I am not certain of the 'really' bit.
'so our men are becoming' is the wordplay.
'are becoming' indicates an anagram.
'so'+'our'+'men'='soourmen'
'soourmen' is an anagram of 'ENORMOUS'.
Can you help me to learn more?
(Other definitions for enormous that I've seen before include "Mammoth" , "Huge, tremendous" , "'Huge, gigantic (8)'" , "Huge, really big" , "Immense" .)