Go just over five days? (3)
I believe the answer is:
wee
'go' is the definition.
(both can mean to urinate)
I don't understand the rest of the clue.
(Other definitions for wee that I've seen before include "Small, like Willy Winkie" , "It's small in Scotland" , "(Scots) little" , "number one" , "Little (Scottish)" .)