This is the noun version of 怒る. So instead of being "to be angry," it's just the idea and concept of anger and wrath.

Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You haven't learned this reading yet, so here's a mnemonic to help you:

I have a lot of anger because I carry (いかり) all of my own things (books, luggage, drinks) and no one will ever carry them for me. Plus, the more things I carry, the more anger I carry inside. Ahh!