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]
(..) Dialogue: Marked=..,Default,NTP,!Effect,Lucky this plant thing's here, really. Dialogue: Marked=..,Default,NTP,!Effect,Stop moving, both of you.\NThis is Devil's Snare. Dialogue: Marked=..,Default,NTP,!Effect,You have to relax. lf you don't,\Nit will only kill you faster. (..)2001 Harry Potter and the Sorcerer's Stone
(..) Dialogue: Marked=..,Default,NTP,!Effect,Best stay close. Dialogue: Marked=..,Default,NTP,!Effect,Oh, Wait a minute.\NGot it here somewhere. Dialogue: Marked=..,Default,NTP,!Effect,Ha! Here's the little devil. Dialogue: Marked=..,Default,NTP,!Effect,Oh, and there's something else as well. (..)2001 Harry Potter and the Sorcerer's Stone