一个英语选修课本上的句子的问题(答好加分）（求大神解答）

Question

句子：It can be difficult if the only disabled toilet is in the basement a long way from where the film is showing.

这里问下 a long way前面为什么 什么东西也没有 如果是定语从句 那也应该是"The basement which has a long way······" Which作定语从句主语时不可以省略的啊。这里为什么是这样

Answer 1

因为它也可以是 It can be difficult if the only disabled toilet is in the basement (that is) a long way from where the film is showing.