> It was an admission *that all might not be right between them.*  
(Source:  **[this][1]** ELL question)

What is the grammatical role of the that-clause here? 

I first thought it's a noun clause serving as the subject of the sentence:

> That all might not be right between them | was | an admission.

But such reading strips the sentence of its original meaning. 


  [1]: http://ell.stackexchange.com/q/41300/2127