定语从句修饰名词性的词,为什么在He wants to go somewhere that is fun for kid

somewhere的用法：
一、基本用法
其词性为副词,有两个主要用法：
1.表示“在某处”.如：
I've seen him somewhere before.我以前在什么地方见到过他.
I've seen your glasses somewhere downstairs.我在楼下什么地方见过你的眼镜.
The church must be somewhere around.那教堂一定在附近.
2.表示“大约”“大概”.如：
He was a thinnish fellow,somewhere in his forties.他瘦瘦的,大约四十多岁.
3.用于短语be getting somewhere,意思是“正在取得进展”.如：
After six months' work on the project,at last I feel I'm getting somewhere.那个项目我搞了半年,终于觉得有所进展.
二、特别用法
1.有时用法类似于名词,如可用作动词的宾语,有时甚至可以后接定语从句.如：
The kids want somewhere to practise their music.孩子们想找个地方去练习音乐.
Having found a hotel,we looked for somewhere to have dinner.在找好旅馆之后,我们就去找吃饭的地方.
Have you got somewhere (that) I can lie down for an hour?你有没有一个什么地方让我躺1个小时?
2.有时还可受形容词的修饰(后置).如：
Let’s go somewhere nice for dinner.咱们找个好地方吃饭吧.

zhe 是定语从句吗