Spurs smelt blood and United had to rely on some smart saves from goalkeeper Paul Woolston, while Will Fish – who saw a shot blocked after a neat one-two with substitute Joe Hugill – needed to be awake to prevent Etete from latching on to a through ball in injury-time and equalising.
While the visitors had a solid argument for leaving with a point, Elanga broke away in the final knockings of the match and placed an angled drive beyond the reach of Whiteman to secure a satisfying victory.
United: Woolston; Bejger, Fish, Mengi (c), Fernandez; Galbraith, Hannibal, Puigmal (Helm 84); Pellistri (Hugill 84), Elanga, Shoretire.
Subs not used: Carney, Devine, McCann.
Booked: Puigmal, Galbraith
Scorers: Shoretire 13, Puigmal 32, 45+2, Elanga 90+3