Wristwatch
Watch
noun
Remember how 時計 is watch? An arm is now there too, making this a wristwatch.
The readings are the words 腕 (same reading as what you learned with the kanji) as well as the reading for 時計. Just don't forget that rendaku!
俺の無くなった腕時計についてちょっと話がしたいんだけど、いいか？あまり時間は取らせないよ。
Can we talk about my missing wristwatch for a second? I won’t take up too much of your time.