Clue: Nutmeg, for one, having bottom pinched by a setter at lunch? (5)
Answer: ASPIC
Explanation: Nutmeg, for one, having bottom pinched by a setter at lunch? (5)
**SPIC**(e) ("nutmeg, for one", *having bottom* (i.e. last letter) *pinched* (i.e taken away) *by* **A ***Aspic is a savoury jelly, so it sets and could be eated at lunch (therefore it could be defined as a "a setter at lunch")