anger that huge salaries and bonuses were paid out for failure.

[lagoo]

One thing that still grates, however. Even as Mr Fankhauser explained how management had worked tirelessly, it did not sooth her anger that huge salaries and bonuses were paid out for failure. "They should have been paid on results," she said. "That's just the way it should have been."
https://www.bbc.com/news/business-50053594

1. ‘sooth’ should have been ‘soothe’;
2. I think the whole sentence is ungrammatical. I can’t find more information about ‘one thing’ from ‘one thing that still grates’, which ends abruptly.
3. Does the underlined ‘that clause’ function as the appositional clause of ‘anger’?

 

[emsr2d2]

1. Yes, it should be "soothe".
2. The opening sentence, in full, would be "There is one thing that still grates [on her], however". Without those opening two words, it does seem quite "abrupt", as you put it.
3. I'll leave the full answer to a grammarian but I can tell you that her anger is specifically about some (unspecified) huge salaries and bonuses that were paid out despite (unspecified) failure.

 

[jutfrank]

3. No.

Let me reformulate the sentence for you, with the that-clause as subject:

That huge bonuses and salaries were paid out for failure did not soothe her anger.