Clarity, Clearness, Clear
な adjective, noun
Something that is bright and clear has great clarity and clearness. Just look at something with such brightness and such clearness! It has so much clarity!
めいりょう
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
さすがベテランアナウンサーなだけあって、彼女はとてもよく聞き取れる明瞭な声でその質問に答えました。
As one would expect from a veteran announcer like her, she answered the question in an easy to understand, clear voice.