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]
(..) "Who told you to attack the machines, you idiots? Without them you'll all die!!" "It's the witch's fault-!" "Let's all watch as the world goes to the devil!" "Find the witch, this is all her fault-! Strike her dead-!!" "Now I'm going to take you home, my Hel!" "The witch-! the witch-! (..)1927 Metropolis