One layer more? One whole layer? It must be much more important than we thought. Let's pay all the more attention, in that case.

This word is often written in kana, but you'll see it in kanji too.

This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. いち goes to いっ.