Possible Clues:

• Rogue sea's churning, negotiating past it will be difficult
• One snooker shot secures quiet stalemate
• Irish butter, being old fashioned, is a dead end
• Situation where progress can't be made
• Road with no outlet
• Deadlocked situation
• Monkey and donkey close to bridge creating gridlock
• Deadlock that is broken by politician: fool!
• Stalemate in negotiations
• This person's exhaust gets bunged up on M25 area gridlock