Bet that would curdle.
Maybe "it's not easy being green" ? still rather obscure and not a direct description, but I think more people might know that one
And personally I only know klondike as a game (havent heard of the ones in the clue) but that one got a reasonable amount of correct guesses. But when I google it the first 5 pages (then I stopped checking) are all about the game, only 1 tiny mention about the yukon area refering to a wiki article.