Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You didn't learn that reading with this kanji, so here's a mnemonic to help you:
You have a bag of walnuts that you're bringing to a friend's house but you trip and drop them all on the ground. You shout, "Mah Walnuts! (まわ)" as they start to revolve around you on the ground. Picture your walnuts going around you, getting all dirty.
I went around 18 holes with a customer today.
That 100 yen coin is still spinning on the desk.
Those kittens revolve around their mother like the planets revolve around the sun.