Don't clip them just to clip them, fan leaves are very important. The primary purpose of fan leaves is to support photosynthesis. The leaves themselves are also packed with phytonutrients and, to a much lesser degree than sugar leaves and buds, cannabinoids. Fan leaves are also incredibly useful for understanding your plant's overall health. So if anything defoliate, which is just removing certain leaves that are blocking flowering sites from getting enough light or if they look unhealthy. Hopefully, I answered your question and remember " Happy Growing and Free your mind one puff at a time ".