At home, the victory over United finally about to happen? (2,3,4)
I believe the answer is:
in the wind
'about to happen?' is the definition.
(something in the wind is likely to happen)
'at home the victory over united finally' is the wordplay.
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'victory' becomes 'win' (a win is a victory).
'over' says to put letters next to each other.
'finally' suggests the final letters.
The last letter of 'united' is 'd'.
'in'+'the'+'win'+'d'='IN THE WIND'
(Other definitions for in the wind that I've seen before include "Likely to happen" , "experiencing more of a chill factor?" , "Astir; afoot" .)