This song was the original B-side to "Royals", but has now found some modest and (hopefully) growing success as a single in its own right. It's a song about her rise to stardom - she's been working with Universal since she was 13, so this wasn't entirely unexpected. Watch the worldwide "Royals" video, and you see it ends..... on a tennis court, with the beginning of this song.
This video is really boring. Unless you like looking at nearly motionless emo New Zealander redheads. The song, on the other hand, is powerful and deep, typical of Lorde's compositions.
As a bonus, here's Lorde actually performing the song, and not just staring at you. It is really great that 1. the song sounds more fuzzed-up live and 2. she looks like she's still enjoying herself!