The new regulations have created 'a devil of' a problem [=a very difficult problem] for many small businesses.
He had 'a devil of a time' getting another job. [=he found it very difficult to get another job]
The shoes look great, but they're 'the devil' to walk in. [=they are very difficult to walk in]
(..) - Skyler? - I know, right? Well, actually, they were my idea, so you are all welcome. You are the devil. Hey, buddy. Ready for a cold one? Nah. I'm not feeling hundred percent. - Oh, no. (..)2013 TvShow: Breaking Bad Title: Blood Money Season: 5 Episode 9