Happy to, so something like "provide an example of when you collaborated with others to reach a goal, and outline the role you played to support the team" is essentially assessing your ability to work well within a team, so any example you provide should bear that in mind - meaning answers which focus around managing others/leadership add little value here and can actually distract away from the points you need to make.
Picture this: The partner takes instructions from the client and delegates the matter to the associate team. The associate team work hard to decide a strategy behind the matter and begin with drafting the documents, asking the trainee for support in research, admin, and pre-drafts of reviews. As a trainee, although you're not leading the matter, your role as a supporter is crucial to the success. All three of you (varying in leadership) striving to reach the common goal of client success. Now, lets look at the question with that scenario in mind - has there been a time where you've supported/collaborated with others to reach a common goal or resolve a particular situation, e.g. close knit team in sales working towards increasing revenue during period of low footfall through communicating with eachother during busy periods to ensure no customer was left ignored whilst others were tended to, sharing ideas as to strategies such as link selling, providing feedback for store performance to manager for further store improvements etc. Although the example itself is fairly simple and may not seem like its moving mountains in the legal world - the question is only assessing skill not legal experience so anything will really do here as long as you can display how it is a good example of teamwork.
Before you begin, think about what makes a good team player and build on from there.