Unlikely chef in a 2007 Pixar film

RAT

This small, whiskered food critic has a knack for French cuisine and leads a secret double life beneath the streets of Paris.

This clue refers to Ratatouille, the 2007 Pixar movie about a rat named Remy who dreams of becoming a chef. The word "unlikely" hints at the absurdity of a rat cooking in a high-end kitchen, while "chef" points to the film’s central theme. The answer is simply "RAT," the type of animal Remy is, not his name or the dish.