Nemesis Clues are bound items that are dropped from your Nemesis's minions. You can get a clue if it has been 6 hours for your last clue and you don't have the mission that you got from the clue. You will normally get a clue every 6 hours. Nemesis attacks will spawn in high density areas. Areas with large monster or destructable items are good to find nemesis ambushes. An example of an area is the area around the mission Waterfront Watcher, where there are many chairs.