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]
(..) - Not that we know of. - Ah, clearly, you don't know much of anything, do you? - Where is Bane? - Oh, we told him it was urgent. - Oh, where is that masked...? - Speak of the devil... and he shall appear. What... the hell is going on? - The plan is proceeding as expected. - Oh, really? (..)2012 The Dark Knight Rises