Steel helmet ( Informal ) (3,3)

I believe the answer is:

tin hat

(Other definitions for tin hat that I've seen before include "Steel helmet (informal)" , "Soldier's helmet" , "Headgear, worn for protection" , "Finish it off to put the protective headgear on it" , "Protective helmet once worn by constuction and mine workers" .)

I've seen this clue in The Independent.

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.