Clue: She could produce The Mousetrap (9)
Answer: DAIRYMAID
Explanation: Definition: She could produce The Mousetrap
 Cryptic defn: ~~Presumably a reference to the nursery rhyme, "Three Blind Mice", in which the rodents ran after the farmer's wife who used a carving knife …. The whole drama could have been averted if the farmer's employee had produced a mousetrap (not the famous Agatha Christie play, of course).~~
Per &2:  One who could make/produce a third-grade flavourless or textureless version of any particular cheese, the former derogatively called a "mousetrap cheese".