Drunken Hogmanay ultimately leads to this (3,4)
I believe the answer is:
new year
'drunken hogmanay ultimately leads to this' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
(Other definitions for new year that I've seen before include "1 January" , "Time around thirty first of December" , "Its eve is Hogmanay" , "Early days?" , "What begins today" .)