Bonjour Dean ! It depends on context: "clairement" is usually used to express clarification, to make a notion or an explanation clearer (more understandable), whereas "nettement" is more physical (I see more neatly), or to mark a rupture, a clear (clear cut) difference from before. "Tu as expliqué la leçon clairement." (You explained the lesson clearly.) "Mon résultat est nettement différent du tien." (My result is clearly different from yours.) If you gave me the context you're referring to, it would be easier for me to tall you for sure :) I hope that's helpful! À bientôt !