Not sure I understand "Skunked" (achievement)

It says “Win a game of Invasion in the first phase”. I understand Invasion, but do they mean “Win a ROUND of Invasion in the first phase”?

You have to win the first phase obviously.

You have to run the clock out on defense, before they can take the first objective.

> You have to run the clock out on defense, before they can take the first objective.

Ok, thanks.