Protective helmet worn by jockeys (8)

I believe the answer is:

skullcap

(Other definitions for skullcap that I've seen before include "Plant" , "Close-fitting headgear with no peak for Jewish men" , "head's small coverage" , "Round brimless hat worn on the crown of the head" , "protective helmet" .)

I've seen this clue in The Guardian.

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.