Go north: journey's ending in minute (5)
I believe the answer is:
weeny
'minute' is the definition.
(I've seen this before)
'go north journey's ending' is the wordplay.
'go' becomes 'wee' (both can mean to urinate).
'north' becomes 'n' ('N' can be a synonym of 'north').
'ending' says to take the final letters.
The final letter of 'journey' is 'y'.
'wee'+'n'+'y'='WEENY'
'in' is the link.
(Other definitions for weeny that I've seen before include "Very small" , "Minute" .)