The term 'ERSATZ FAT BRAND' is a crossword solution that can be filled in with the word 'OLEAN', which is a brand of fat substitute created by Procter & Gamble. OLEAN is a zero-calorie, fat-free food additive made from olestra, a synthetic fat molecule. It was introduced in the late 1990s as a healthier alternative to traditional fats and oils, but it has since been discontinued due to its potential side effects.