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]
(..) the heyday in the blood is tame It's humble and waits upon the judgment And what judgment would step from this to this? What devil was it that thus hath cozened you at blind man's buff? Oh shame, where is thy blush? Rebellious hell, if thou canst mutiny in a matron's bones to flaming youth... (..)2015 Hamlet