Go large? Quite the opposite! (3)

I believe the answer is:
wee
'go' is the definition.
(both can mean to urinate)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for wee that I've seen before include "Little (Scottish)" , "It's small in Scotland" , "Informally tiny as in Scotland" , "number one" , "Minute" .)
