Pedant, stickler (7)

I believe the answer is:

fusspot

(Other definitions for fusspot that I've seen before include "Over-fastidious person" , "Person hard to please" , "bit of a worrier" , "Pernickety person" , "Finicky person" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.