They usually want an example of what the team was (could be work, sport, committee, etc) The task of the team at the particular time of your example (be specific, do not generalise). Your role within the team, how you worked/reported to others within the team during the task. How the task went, with your part shown. If the task was successful/unsuccessful (it doesn't matter, but I like to put down successful tasks). How the team carried out any post-task activity (de-briefings, feedback etc).
Hope this is of use to you