The cause of the problem was not 'immediately' clear. [=is was not known right away]
They live in the house 'immediately' [='directly'] behind this one.
We need to leave 'immediately'. [='at once', 'right away']
(..) A few hours ago, President Underwood resigned the office of President of the United States. And in a private ceremony attended by staff, Effective immediately, she will be assuming the office - You must be so proud of him. And while President Francis Underwood couldn't be here today... (..)2017 TvShow: House of Cards Title: Chapter 65 Season: 5 Episode 13