此英语句型中有点疑问!

此英语句型中有点疑问!
Pappy's friend eyed him for a moment and said ,"How about Cal? You want him ,don't you?" There was a touch of amusement in his voice.
这句话的上下文意思是当Pappy的朋友得知联邦探员可能不会抓Cal的时候感到很好奇,由此发出提问.
我想问得是,后半句中的a touch of amusement 是什么意思? 难道是:"他的声音中带有一点兴趣?"我觉得这么解释不通呀!但是amsement又只能解释兴趣和娱乐呀?望高手帮帮我呀!